It's now the done thing for broadcasters to refuse to show streakers. As we're all very serious people and football is a serious thing we wholeheartedly agree with them and don't think it's at all funny when someone runs around with their dangly bits out.
But it seems no one has told LeBron James that streakers are no longer supposed to be funny. LeBron is lucky enough to be at the World Cup final and he kindly showed the world what the TV folks wouldn't, and he found it hilarious. Cheers, LeBron.