So SPOILERS, but for a while The Undertaker has been using a gogoplata - sold by the announcers as something called 'The Hell's Gate' - as one of his finishers. As far as I can tell he normally does it properly, but on Sunday, in the middle of the 19th defence of his unbeaten Wrestlemania 'streak', this happened:

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It's difficult to see, but essentially what happened is that Triple H put his arm in the wrong place, The Undertaker fumbled for a couple of seconds, and they both seemed to decide to 'sell' the move without it being even vaguely locked in place. In case you can't tell, the problem is that 'Taker's right leg should be over the top of H's left arm. It isn't, so H could just pull out. What's more, he (SPOILERS) tapped Triple H with the move, so the biggest match at this year's Wrestlemania ended on a move that wouldn't even work.