Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

Director William Friedkin attends a walking tour around Georgetown that focused on some of the film locations from the original Exorcist in Washington D.C., U.S. April 17, 2018. REUTERS/Carlos Barria

A priest holds a leaflet advertising a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

A priest poses for a picture next to a banner advertising a course for aspiring exorcists in Rome, Italy April 16, 2018. The banner reads "Course about exorcism and prayer of liberation". REUTERS/Tony Gentile

A priest attends a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

Cardinal Ernest Simoni leaves during a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

Cardinal Ernest Simoni talks during a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

A nun attends a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

Priests attend a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

Cardinal Ernest Simoni attends a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

Cardinal Ernest Simoni talks during a course for aspiring exorcists in Rome, Italy April 16, 2018. REUTERS/Tony Gentile

Yury Oorzhak (L), a shaman representing the so-called Adyg Eeren (Bear Spirit) society, conducts a spiritualistic session with customers on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Duger Khomushku (R), a shaman representing the so-called Dungur society, conducts a spiritualistic session with a customer on the exorcism of evil spirits at a court yard of his residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Duger Khomushku (R), a shaman representing the so-called Dungur society, conducts a spiritualistic session with a customer on the exorcism of evil spirits at a court yard of his residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

Lyudmila Oyun, a shaman representing the so-called Adyg Eeren (Bear Spirit) society, smokes while conducting a spiritualistic session with a customer on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Duger Khomushku (back), a shaman representing the so-called Dungur society, conducts a spiritualistic session with customers on the exorcism of evil spirits at a court yard of his residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Duger Khomushku, shaman and head of the so-called Dungur society, leaves a wooden house before conducting a spiritualistic session with a customer on the exorcism of evil spirits at a courtyard of her residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

Lyudmila Oyun (R), a shaman representing the so-called Adyg Eeren (Bear Spirit) society, conducts a spiritualistic session with a customer on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Lyudmila Oyun (L), a shaman representing the so-called Adyg Eeren (Bear Spirit) society, conducts a spiritualistic session with a customer on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Lyudmila Oyun, a shaman representing the so-called Adyg Eeren (Bear Spirit) society, smokes before conducting a spiritualistic session with a customer on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Anisya Mongush (L), a shaman representing the so-called Dungur society, conducts a spiritualistic session with a customer on the exorcism of evil spirits at her residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Anisya Mongush (L), a shaman representing the so-called Dungur society, uses paws of a bear while conducting a spiritualistic session with a customer on the exorcism of evil spirits at her residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Lyudmila Oyun (L), a shaman representing the so-called Adyg Eeren (Bear Spirit) society, conducts a spiritualistic session with a customer on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Yury Oorzhak (R), a shaman representing the so-called Adyg Eeren (Bear Spirit) society, conducts a spiritualistic session with customers on the future telling and exorcism of evil spirits at a residence in the town of Kyzyl, the administrative centre of the Republic of Tuva (Tyva region) in Southern Siberia, Russia November 3, 2016. The region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. REUTERS/Ilya Naymushin

Bishop Manuel Acuna, head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 12, 2016. Picture taken April 12, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna, head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 12, 2016. Picture taken April 12, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna, head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (L), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (L), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (L), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (center R), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 12, 2016. Picture taken April 12, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (L), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna, head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (C), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 12, 2016. Picture taken April 12, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna (L), head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 26, 2016. Picture taken April 26, 2016. REUTERS/Enrique Marcarian

Bishop Manuel Acuna, head of the Independent Lutheran Church of Argentina, instructs a group of his followers at Good Shepherd parish in Santos Lugares, outskirts of Buenos Aires, Argentina, April 12, 2016. Picture taken April 12, 2016. REUTERS/Enrique Marcarian

Coptic Orthodox Christians listen as father Makary speaks before prayers at St Mark Cathedral in Cairo January 2, 2015. Many devotees attend father Makary's congregation with the hope to be healed from their illnesses. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

Coptic Orthodox Christians listen as father Makary speaks before prayers at St Mark Cathedral in Cairo January 2, 2015. Many devotees attend father Makary's congregation with the hope to be healed from their illnesses. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

An Indian woman, greets father Makary after hearing his prayers at St Mark Cathedral in Cairo January 2, 2015. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

Coptic Orthodox Christians touch the pictures of the Virgin Mary and Jesus (L) and Pope St. Kyrillos VI for blessings after a religious session by Father Makary at St Mark Catedral in Cairo January 2, 2015. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

A Coptic Orthodox Christian girl, who is believed to be possessed, holds the hand of father Makary after hearing his prayers at St Mark Cathedral in Cairo December 26, 2014. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken December 26, 2014. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

Coptic Orthodox Christian pray during a religious session by father Makary at St Mark Cathedral in Cairo December 26, 2014. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken December 26, 2014. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

A Coptic Orthodox Christian prays after a religious session by father Makary at St Mark Cathedral in Cairo January 2, 2015. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

A Coptic Orthodox Christian prays after a religious session by father Makary at St Mark Cathedral in Cairo January 2, 2015. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

A Coptic Orthodox Christian man who is believed to be possessed is assisted by other men after hearing prayers by father Makary at St Mark Cathedral in Cairo January 2, 2015. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

A Coptic Orthodox Christian man who is believed to be possessed is assisted by other men after hearing prayers by father Makary at St Mark Cathedral in Cairo January 2, 2015. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken January 2, 2015. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

A Coptic Orthodox Christian girl who is believed to be possessed is assisted by other women after hearing prayers by father Makary at St Mark Cathedral in Cairo December 26, 2014. Coptic Orthodox Christians believe in the divine mystery of the healing from psychological and physical illnesses. Father Makary Younan is one of the most popular among the Coptic Egyptians to practice exorcism. Picture taken December 26, 2014. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION SOCIETY)

Women take a "selfie" with musicians and healers of band "Mazaher Zar" after the band performed a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY TPX IMAGES OF THE DAY)

Om Sameh, a musician and healer of band "Mazaher Zar" performs a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY)

A musicians and healers of band "Mazaher Zar" prepares his equipment before performing a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY)

Musicians and healers of band "Mazaher Zar" perform a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY)

Musicians and healers of band "Mazaher Zar" perform a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY)

Musicians and healers of band "Mazaher Zar" perform a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY)

Musicians and healers of band "Mazaher Zar" perform a traditional exorcism ritual in Cairo late November 12, 2014. Egyptians dance the "Zar", a traditional dance of frenzied movements, to captivating music that has its roots in an exorcism ritual. It has been part of Egyptian culture since ancient times to dance to drive away evil spirits and negative energy. The "Zar" religious ceremony, which uses drumming and dancing to cure an illness thought to be caused by a demon, is most prominent in southern Egypt and is practiced further south into the Sudan, though it may be performed anywhere in Egypt. Picture taken November 12, 2014. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: SOCIETY)