The Obamas and the Royal Family got in the biggest Royal Beef since 1776, challenging one another to "bring it" to Prince Harry's Invictus Games, an olympiad for wounded service members. Barack and Michelle Obama fired the first shot with their video challenge, and Prince Harry raised the stakes by getting his nana, The Queen, in on the action.

Unfortunately for you @michelleobama and @barackobama I wasn't alone when you sent me that video 😉 - Prince Harry

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Now Justin Trudeau, Prime Minister of the Queen's Royal Dominion of Canada, wanted in on the action, setting aside Canadian niceties to show off his strength.