U.S. President Joe Biden offers his elbow to Britain's Queen Elizabeth during a meeeting at Windsor Castle in Windsor, Britain, June 13, 2021. REUTERS/Dylan Martinez

U.S. President Joe Biden offers his elbow to Britain's Queen Elizabeth during a meeeting at Windsor Castle in Windsor, Britain, June 13, 2021. REUTERS/Dylan Martinez

Britain's Prime Minister Boris Johnson and German Chancellor Angela Merkel elbow bump as they attend a bilateral meeting during G7 summit in Carbis Bay, Cornwall, Britain, June 12, 2021. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson and German Chancellor Angela Merkel elbow bump as they attend a bilateral meeting during G7 summit in Carbis Bay, Cornwall, Britain, June 12, 2021. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson and German Chancellor Angela Merkel elbow bump as they attend a bilateral meeting during G7 summit in Carbis Bay, Cornwall, Britain, June 12, 2021. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson and German Chancellor Angela Merkel elbow bump as they attend a bilateral meeting during G7 summit in Carbis Bay, Cornwall, Britain, June 12, 2021. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson and France's President Emmanuel Macron elbow bump as they attend a bilateral meeting during G7 summit in Carbis Bay, Cornwall, Britain, June 12, 2021. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets Canada's Prime Minister Justin Trudeau, with an elbow bump as Carrie Johnson looks on, during the Leaders official welcome and family photo at the G7 Summit in Carbis Bay, Cornwall, Britain, June 11, 2021. Leon Neal/Pool via REUTERS

Britain's Prime Minister Boris Johnson, his spouse Carrie Johnson and Canada's Prime Minister Justin Trudeau bump elbows during the G7 summit in Carbis Bay, Cornwall, Britain, June 11, 2021. REUTERS/Phil Noble/Pool

U.S. President Joe Biden bumps elbows with Britain's Prime Minister Boris Johnson's spouse Carrie Johnson, next to Britain's Prime Minister Boris Johnson and U.S. First Lady Jill Biden, during the G7 summit in Carbis Bay, Cornwall, Britain, June 11, 2021. REUTERS/Kevin Lamarque/Pool

Canada's Prime Minister Justin Trudeau bumps elbows with Britain's Prime Minister Boris Johnson's spouse Carrie Johnson, next to Britain's Prime Minister Boris Johnson, during the G7 summit in Carbis Bay, Cornwall, Britain, June 11, 2021. REUTERS/Kevin Lamarque/Pool

Britain's Prime Minister Boris Johnson bumps elbow with France's President Emmanuel Macron as he arrives with France's first lady Brigitte Macron, during the G7 summit in Carbis Bay, Cornwall, Britain, June 11, 2021. REUTERS/Kevin Lamarque/Pool TPX IMAGES OF THE DAY

U.S. Secretary of State Antony Blinken greets a former colleague with an elbow bump as he arrives to testify about the State Department budget before the Senate Appropriations Committee on Capitol Hill in Washington, U.S. June 8, 2021. REUTERS/Jonathan Ernst

U.S. Secretary of State Antony Blinken greets a former colleague with an elbow bump as he arrives to testify about the State Department budget before the Senate Appropriations Committee on Capitol Hill in Washington, U.S. June 8, 2021. REUTERS/Jonathan Ernst

Japan's Finance Minister Taro Aso and Italy's Economy and Finance Minister Daniele Franco elbow bump at Lancaster House during a finance ministers' meeting ahead of the G7 Summit, in London, Britain June 5, 2021. Rob Pinney/Pool via REUTERS

Japan's Finance Minister Taro Aso and Eurogroup President Paschal Donohoe elbow bump at Lancaster House during a finance ministers' meeting ahead of the G7 Summit, in London, Britain June 5, 2021. Rob Pinney/Pool via REUTERS

Japan's Finance Minister Taro Aso (L) and Eurogroup President Paschal Donohoe elbow bump at Lancaster House during a finance ministers' meeting ahead of the G7 Summit, in London, Britain June 5, 2021. Rob Pinney/Pool via REUTERS

U.S. Secretary of State Antony Blinken and Costa Rica's President Carlos Alvarado Quesada elbow bump each other after a news conference in San Jose, Costa Rica, June 1, 2021. REUTERS/Evelyn Hockstein/Pool

U.S. Secretary of State Antony Blinken and Costa Rica's President Carlos Alvarado Quesada elbow bump each other after a news conference in San Jose, Costa Rica, June 1, 2021. REUTERS/Evelyn Hockstein/Pool

U.S. Secretary of State Antony Blinken and Costa Rica's President Carlos Alvarado Quesada prepare to elbow bump each other after a news conference in San Jose, Costa Rica, June 1, 2021. REUTERS/Evelyn Hockstein/Pool

U.S. Secretary of State Antony Blinken and Costa Rica's President Carlos Alvarado Quesada elbow bump each other after a news conference in San Jose, Costa Rica, June 1, 2021. REUTERS/Evelyn Hockstein/Pool

The Supreme Allied Commander Europe (SACEUR), General Tod D. Wolters and Assistant Secretary General for Defence Policy and Planning, Patrick Turner, bump elbows as they take part in an online North Atlantic Council meeting at the Alliance's headquarters, in Brussels, Belgium June 1, 2021. REUTERS/Johanna Geron/Pool

European Council President Charles Michel bumps elbows with European Commission President Ursula von der Leyen during a plenary session at the European Parliament in Strasbourg, France June 9, 2021. Julien Warnand/Pool via REUTERS

France's President Emmanuel Macron and South Africa's President Cyril Ramaphosa bump elbows after a news conference during a state visit, at the Union Buildings in Pretoria, South Africa May 28, 2021. REUTERS/Siphiwe Sibeko

European Parliament President David Sassoli bumps elbows with European Council President Charles Michel at the celebration of Greece's 40th anniversary of joining the European Union, at the Zappeion Hall in Athens, Greece, May 27, 2021. REUTERS/Louiza Vradi

European Parliament President David Sassoli bumps elbows with Greek Prime Minister Kyriakos Mitsotakis at the celebration of Greece's 40th anniversary of joining the European Union, at the Zappeion Hall in Athens, Greece, May 27, 2021. REUTERS/Louiza Vradi

German Defense Minister Annegret Kramp-Karrenbauer (L) and South Korean Defense Minister Suh Wook bump elbows before their meeting at the Defense Ministry in Seoul, South Korea, May 26, 2021. Jeon Heon-Kyun/Pool via REUTERS

Iranian Deputy at Ministry of Foreign Affairs Abbas Araghchi and Deputy Secretary General of the European External Action Service (EEAS), Enrique Mora, bump elbows in front of a hotel where a meeting of the Joint Commission of the Joint Comprehensive Plan of Action (JCPOA) is held, in Vienna, Austria, May 25, 2021. REUTERS/Leonhard Foeger

Kenya's Chief Justice Martha Koome and Deputy Chief Justice Philomena Mwilu greet by the elbow during a reception after Koome's swearing-in ceremony, outside the Supreme Court building in Nairobi, Kenya May 21, 2021. REUTERS/Monicah Mwangi

World Trade Organization Director-General Ngozi Okonjo-Iweala bumps elbows with Ireland's Trade Minister Leo Varadkar during a European Foreign Trade ministers meeting at the European Council headquarters in Brussels, Belgium May 20, 2021. Francisco Seco/Pool via REUTERS

France's President Emmanuel Macron bumps elbows with European Council President Charles Michel as Rwanda's President Paul Kagame looks on before the opening session of the Summit on the Financing of African Economies, in Paris, France, May 18, 2021. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron bumps elbows with Mozambique's President Filipe Nyusi before the opening session of the Summit on the Financing of African Economies, in Paris, France, May 18, 2021. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron bumps elbows with Ghana's President Nana Akufo-Addo before the opening session of the Summit on the Financing of African Economies, in Paris, France, May 18, 2021. Ludovic Marin/Pool via REUTERS

Britain's Prime Minister Boris Johnson bumps elbows with a man during a coronavirus disease (COVID-19) vaccination site visit at the Business Design Centre in Islington, London, Britain, May 18, 2021. Jeremy Selwyn/Pool via REUTERS

Germany's Foreign Minister Heiko Maas greets U.S. Special Presidential Envoy for Climate John Kerry with an elbow bump prior to a meeting at the Foreign Office in Berlin, Germany May 18, 2021. Odd Andersen/Pool via REUTERS

Germany's Foreign Minister Heiko Maas greets U.S. Special Presidential Envoy for Climate John Kerry with an elbow bump prior to a meeting at the Foreign Office in Berlin, Germany May 18, 2021. Odd Andersen/Pool via REUTERS

U.S. Secretary of State Antony Blinken and Danish Foreign Minister Jeppe Kofod elbow bump at the end of a joint news conference following meetings at the Danish Foreign Ministry in Copenhagen, Denmark, May 17, 2021. Saul Loeb/Pool via REUTERS

Archbishop Desmond Tutu is greeted with elbow bumps as he arrives to receive his coronavirus (COVID-19) vaccination in Cape Town, South Africa, May 17, 2021. REUTERS/Mike Hutchings

Scotland's First Minister Nicola Sturgeon and candidate Anum Qaisar-Javed bump elbows as they visit Airdrie ahead of a by-election, in Airdrie, Scotland, Britain, May 12, 2021. REUTERS/Russell Cheyne/Pool

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, elbow bumps Sen. Patty Murray (D-WA) before a Senate Health, Education, Labor and Pensions Committee hearing to discuss the on-going federal response to COVID-19, at the U.S. Capitol in Washington, D.C., U.S., May 11, 2021. Greg Nash/Pool via REUTERS

Luxembourg's Foreign Minister Jean Asselborn, right, is greeted with an elbow bump by Cypriot Foreign Minister Nicos Christodoulides during an EU foreign ministers meeting at the European Council building in Brussels, Belgium May 10, 2021. Olivier Matthys/Pool via REUTERS

Hungary's Prime Minister Viktor Orban bumps elbows with a woman as he arrives to attend European Social Summit in Porto, Portugal, May 7, 2021. Jose Coelho/Pool via REUTERS

Britain's Prime Minister Boris Johnson and Jill Mortimer, newly elected MP for Hartlepool, bump elbows at Jacksons Wharf Marina in Hartlepool following local elections, Britain, May 7, 2021. REUTERS/Lee Smith

Seiko Hashimoto, president of the Tokyo 2020 Organising Committee (L), elbow bumps with Sebastian Coe, president of World Athletics, ahead of a meeting on May 7, 2021 in Tokyo, Japan. Carl Court/Pool via REUTERS

Britain's Foreign Secretary Dominic Raab and South Africa's Minister of International Relations and Cooperation Naledi Pandor bump elbows as they pose at Chevening House, Kent, Britain May 6, 2021. Niklas Halle'n/Pool via REUTERS

Britain's Foreign Secretary Dominic Raab and South Africa's Minister of International Relations and Cooperation Naledi Pandor bump elbows as they pose at Chevening House, Kent, Britain May 6, 2021. Niklas Halle'n/Pool via REUTERS

Britain's Foreign Secretary Dominic Raab and South Africa's Minister of International Relations and Cooperation Naledi Pandor bump elbows as they pose at Chevening House, Kent, Britain May 6, 2021. Niklas Halle'n/Pool via REUTERS

U.S. Vice President Kamala Harris bumps elbows with Rep. Jim Langevin (D-RI) upon her arrival in Providence, Rhode Island, U.S., May 5, 2021. REUTERS/Kevin Lamarque

British Prime Minister Boris Johnson wears a Welsh-flag mask as he touches elbows with a campaigner during a visit to Barry for the Senedd election campaign, in Vale of Glamorgan, Wales, Britain May 3, 2021. Matthew Horwood/Pool via REUTERS

U.S. Secretary of Energy Jennifer Granholm bumps elbows with Howard University student Christopher Flowers after a roundtable discussion at Howard University in Washington, U.S., May 3, 2021. Stefani Reynolds/Pool via REUTERS

Scotland's First Minister Nicola Sturgeon and Joan McAlpine bump elbows as they campaign in Midsteeple Quarter for the Scottish Parliament election, in Dumfries, Scotland, Britain May 3, 2021. Jeff J Mitchell/Pool via REUTERS

Britain's Prime Minister Boris Johnson bumps elbows with a member of the public as he campaigns on behalf of Conservative Party candidate Jill Mortimer in Hartlepool, Britain May 3, 2021. Lindsey Parnaby/Pool via REUTERS

Britain's Prime Minister Boris Johnson bumps elbows with a member of the public as he campaigns on behalf of Conservative Party candidate Jill Mortimer in Hartlepool, Britain May 3, 2021. Lindsey Parnaby/Pool via REUTERS

Britain's Prime Minister Boris Johnson bumps elbows with a person during a science lesson at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

U.S. President Joe Biden elbow bumps Speaker of the House Nancy Pelosi as he greets her and Vice President Kamala Harris after concluding his address to a socially distant joint session of the U.S. Congress at the U.S. Capitol in Washington, U.S., April 28, 2021. REUTERS/Jonathan Ernst/Pool

U.S. President Joe Biden bumps elbows with Speaker of the House Nancy Pelosi (D-CA) after speaking to a joint session of Congress in the House chamber of the U.S. Capitol in Washington, U.S., April 28, 2021. Chip Somodevilla/Pool via REUTERS

U.S. President Joe Biden elbow bumps with House Speaker Nancy Pelosi of Calif, after speaking to a joint session of Congress in the House chamber of the U.S. Capitol in Washington, U.S., April 28, 2021. Andrew Harnik/Pool via REUTERS

U.S. President Joe Biden elbow bumps with Speaker of the House Nancy Pelosi, D-Calif., as Vice President Kamala Harris claps at the end of his address to the joint session of Congress in the House chamber of the U.S. Capitol in Washington, U.S., April 28, 2021. Caroline Brehman/Pool via REUTERS

President Joe Biden elbow bumps House Speaker Nancy Pelosi (D-Calif.) as he addresses a joint session of Congress, with Vice President Kamala Harris and Pelosi on the dais behind him, in Washington, U.S., April 28, 2021. Melina Mara/Pool via REUTERS

President of North Macedonia Stevo Pendarovski and NATO Secretary General Jens Stoltenberg bump elbows after a joint news conference at the Alliance headquarters in Brussels, Belgium April 28, 2021. REUTERS/Yves Herman/Pool