Eddie Izzard, one of the funniest men I know of, also appears to be one of the toughest. He just finished running 43 marathons in seven weeks. That's six days a week running at least 27 miles per day. The total "course" was a lap of the UK over 1,100 miles long. He did it for a charity called "Sport Relief", and if you're as astounded as I am, you can donate here.
Izzard has been in several movies, and has done several hilarious standup tours, including one for HBO that is one of the funniest hours I've ever spent. One of his signature characteristics (apart from being hilarious) is that in his standup performances, he's a cross-dresser. As the linked article notes, he's probably not putting his heels on for a while, but damn, what an achievement! Bravo, Eddie!!