There's an oft-repeated claim that verteran British actor and explorer Brian Blessed punched a polar bear in the face while on an Arctic expedition. Apparently he himself has made this claim in interviews. Here's an example of the claim, from an article 7 Reasons Why Brian Blessed is the Best Human:
He is the oldest man ever to reach the North Pole and the Magnetic North Pole. Whilst there, he punched a polar bear – and I’m quoting the man himself directly here – “straight in its f***ing face.”
I've always assumed it couldn't be true - but there are many things about Brian Blessed's life which seem ridiculous and unbelievable but none-the-less appear to be true.
It's one of those popular stories that turns up in surprising places. For example, here's an artists' impression of what this scene might have looked like, from popular internet MS Paint artist Jim'll Paint It: