Chris Kerr poses with Gizzard, a Chihuahua, dressed as Regan from the film "The Exorcist" at the Tompkins Square Halloween Dog Parade in Manhattan, New York City, U.S., October 20, 2019. REUTERS/Andrew Kelly 

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 

A dog and owners dressed as characters from "The Exorcist" take part in a Halloween dog parade in Monterrey, Mexico, October 29, 2017. REUTERS/Daniel Becerril 

A woman dressed up as a character from the movie "The Exorcist" reacts during Halloween in La Fresneda, northern Spain, October 31, 2016. REUTERS/Eloy Alonso 

A woman dressed up as a character from the movie "The Exorcist" reacts during Halloween in La Fresneda, northern Spain, October 31, 2016. REUTERS/Eloy Alonso 

Cast member Ben Daniels attends a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast member Geena Davis speaks at a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast members Geena Davis and Ben Daniels attend a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast member Alan Ruck speaks at a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast member Geena Davis attends a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast member Geena Davis attends a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast member Geena Davis attends a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

Cast member Geena Davis attends a panel for the television series "The Exorcist" during the TCA FOX Summer Press Tour in Beverly Hills, California U.S., August 8, 2016. REUTERS/Mario Anzuoni 

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) 

Fifty-six-year-old exorcist Kansho Aizawa (R) holds a spiritual cleansing ritual for a woman at a temporary house in Higashimatsushima, Miyagi prefecture, February 21, 2013, ahead of the second-year anniversary of the March 11, 2011 earthquake and tsunami. The tsunami that engulfed northeastern Japan two years ago has left some survivors believing they are seeing ghosts. In a society wary of admitting to mental problems, many are turning to exorcists for help. Picture taken February 21, 2013. REUTERS/Chris Meyers (JAPAN - Tags: DISASTER) 

A devotee who is believed to be possessed by evil spirits smokes a bidi as she walks around the courtyard of Guru Deoji Maharaj temple during a ghost fair at Malajpur village in Betul district in the central Indian state of Madhya Pradesh January 27, 2013. People from across India come to this fair to be exorcised of ‘evil spirits’. They are usually brought by relatives and they are most often women. The exorcism involves running around the temple courtyard to make the 'ghost' weak then being beaten by a priest with a broom. Picture taken January 27, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY RELIGION)

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A man holds a devotee who is believed to be possessed by evil spirits by her hair while confronting her as she goes into a state of trance while lying on a sacred platform at Guru Deoji Maharaj temple during a ghost fair at Malajpur village in Betul district in the central Indian state of Madhya Pradesh January 26, 2013. People from across India come to this fair to be exorcised of ‘evil spirits’. They are usually brought by relatives and they are most often women. The exorcism involves running around the temple courtyard to make the 'ghost' weak then being beaten by a priest with a broom. Picture taken January 26, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY RELIGION)

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A devotee who is believed to be possessed by evil spirits falls on the ground at Guru Deoji Maharaj temple during a ghost fair at Malajpur village in Betul district in the central Indian state of Madhya Pradesh January 27, 2013. People from across India come to this fair to be exorcised of ‘evil spirits’. They are usually brought by relatives and they are most often women. The exorcism involves running around the temple courtyard to make the 'ghost' weak then being beaten by a priest with a broom. Picture taken January 27, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY RELIGION)

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A devotee who is believed to be possessed by evil spirits lies in a state of trance on a sacred platform at Guru Deoji Maharaj temple during a ghost fair at Malajpur village in Betul district in the central Indian state of Madhya Pradesh January 27, 2013. People from across India come to this fair to be exorcised of ‘evil spirits’. They are usually brought by relatives and they are most often women. The exorcism involves running around the temple courtyard to make the 'ghost' weak then being beaten by a priest with a broom. Picture taken January 27, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY)

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A devotee who is believed to be possessed by evil spirits cries in a state of trance at Guru Deoji Maharaj temple during a ghost fair at Malajpur village in Betul district in the central Indian state of Madhya Pradesh January 27, 2013. People from across India come to this fair to be exorcised of ‘evil spirits’. They are usually brought by relatives and they are most often women. The exorcism involves running around the temple courtyard to make the 'ghost' weak then being beaten by a priest with a broom. Picture taken January 27, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY)

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Hermes Cifuentes, who is also known as "Brother Hermes", performs an exorcism ritual on Irma Beatriz (bottom), 46, and Marleny Munoz (top), 55, both who claim to be possessed by spirits, in La Cumbre, Valle July 7, 2012. Cifuentes says he has performed more than 35,000 exorcism rituals in the past 25 years. Picture taken July 7, 2012. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: SOCIETY RELIGION) 

Irma Beatriz, 46, who claims to be possessed by spirits, holds an egg and a cross during an exorcism ritual performed by Hermes Cifuentes in La Cumbre, Valle July 7, 2012. Cifuentes, who is also known as "Brother Hermes", says he has performed more than 35,000 exorcism rituals in the past 25 years. Picture taken July 7, 2012. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: SOCIETY RELIGION) 

Hermes Cifuentes, who is also known as "Brother Hermes", performs an exorcism on Marleny Munoz, 55, who claims to be possessed by spirits in La Cumbre, Valle July 7, 2012. Cifuentes says he has performed more than 35,000 exorcism rituals in the past 25 years. Picture taken July 7, 2012. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: SOCIETY RELIGION) 

Hermes Cifuentes, who is also known as "Brother Hermes", performs an exorcism on Gisela Marulanda, 23, who claims to be possessed by spirits in La Cumbre, Valle September 5, 2012. Cifuentes says he has performed more than 35,000 exorcism rituals in the past 25 years. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: SOCIETY RELIGION) 

Gisela Marulanda, 23, who claims to be possessed by spirits, participates in an exorcism ritual performed by Hermes Cifuentes (not pictured) in La Cumbre, Valle September 5, 2012. Cifuentes, who is known as "Brother Hermes", says he has performed more than 35,000 exorcism rituals in the past 25 years. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: SOCIETY RELIGION) FOR BEST QUALITY IMAGE ALSO SEE: GM1E89J16KP01 

Muhammad Rehan sits chained by his ankle to a wall in compounds of the Abdullah Shah Ashabi Sufi shrine in Thatta district, in Pakistan's Sindh province, November 24, 2011. Rehan, 18, suffers from violent fits and was brought to the compound so that he can be close to the spirit of the saint, according to his mother Jamila Bibi. He is kept chained to prevent him from hitting other people. Many Pakistanis think their sufferings are inflicted by evil spirits intent on destroying marriage prospects, businesses and health, and that only Sufi saints can help. It is a risky belief in Pakistan as militants, including the al Qaeda-linked Taliban, have over the years bombed Sufi shrines which they consider heretical. But fears of possession, and life's many challenges, keep driving people back to the shrines. Picture taken November 24, 2011. To match feature PAKISTAN-EXORCISM/ REUTERS/Rebecca Conway (PAKISTAN - Tags: RELIGION SOCIETY) 

Sheikh Ahmed Nemir sits in his home during an interview with Reuters in Khan Younis in the southern Gaza Strip February 28, 2011. Nemir, a Hamas leader and well-known Muslim cleric, believes in the power of possession, unlike some of his peers, and says economic hardship and the poor psychological condition of many Gazans has encouraged evil spirits. Although precise data on exorcism in Gaza is not available, anecdotal evidence suggests it is highly popular and police are trying to keep track of something that is all too easy to abuse. Picture taken February 28, 2011. To match Feature PALESTINIANS-GAZA-EXORCISTS/ REUTERS/Ahmed Zakot (GAZA - Tags: SOCIETY POLITICS RELIGION)

Sheikh Ahmed Nemir sits in his home during an interview with Reuters in Khan Younis in the southern Gaza Strip February 28, 2011. Nemir, a Hamas leader and well-known Muslim cleric, believes in the power of possession, unlike some of his peers, and says economic hardship and the poor psychological condition of many Gazans has encouraged evil spirits. Although precise data on exorcism in Gaza is not available, anecdotal evidence suggests it is highly popular and police are trying to keep track of something that is all too easy to abuse. Picture taken February 28, 2011. To match Feature PALESTINIANS-GAZA-EXORCISTS/ REUTERS/Ahmed Zakot (GAZA - Tags: SOCIETY POLITICS RELIGION)

Father Gary Thomas of Sacred Heart Parish in Saratoga, California, a Vatican-trained exorcist and advisor on the film "The Rite", poses at the film's premiere in Hollywood, California January 26, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT) 

Father Gary Thomas of Sacred Heart Parish in Saratoga, California, a Vatican-trained exorcist and advisor on the film "The Rite", poses at the film's premiere in Hollywood, California January 26, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT) 

Malaysia's top Islamic faith healer Haron Din (R) and his patients recite Quranic verses infront of "water medicine" at his "clinic" outside Kuala Lumpur October 5, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine.Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine. Photo taken October 5, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Malaysian Chinese faith healer Tan Giak Ann prepares before consulting patients at a temple in Kuala Lumpur October 13, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine.
Photo taken October 13, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Patients stand in line as early as 4:30 a.m. at a "faith healing clinic" outside Kuala Lumpur October 5, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine.
Photo taken October 5, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

A Malaysian Chinese faith healer writes a scripture for a patient during a consultation at a temple in Kuala Lumpur October 13, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine.Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine.
Photo taken October 13, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Malaysian Chinese faith healer Tan Giak Ann performs a prayer around a temple before consulting patients in Kuala Lumpur October 13, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine.
Photo taken October 13, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Islamic faith healers and patients recite Quranic verses infront of "water medicine" at a "faith healing clinic" outside Kuala Lumpur October 5, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine.
Photo taken October 5, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Malaysian Chinese faith healer Tan Giak Ann talks to a patient at a temple in Kuala Lumpur October 13, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine. Photo taken October 13, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Malaysian Chinese faith healer smokes a scripture for a patient during a consultation at a temple in Kuala Lumpur October 13, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine. Photo taken October 13, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Malaysian Chinese faith healer Tan Giak Ann talks to a patient at a temple in Kuala Lumpur October 13, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine. Photo taken October 13, 2010. To match Reuters Life! MALAYSIA-FAITH-HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY) 

Malaysia's top Islamic faith healer Haron Din (L) recites Quranic verses onto his patient at his "clinic" outside Kuala Lumpur October 5, 2010. Faith healing continues to find favour in this mainly Muslim country, underscoring the tension between tradition and modernity in Malaysia, a melting pot of Asian cultures with a long history of alternative medicine. Though uncommon, the continued use of exorcists and bomoh, or faith healers, has in part led the government to draft a law to regulate practitioners of traditional and complementary medicine. Photo taken October 5, 2010. To match Reuters Life! MALAYSIA-FAITH HEALERS/ REUTERS/Bazuki Muhammad (MALAYSIA - Tags: RELIGION HEALTH SOCIETY)