Not only is he one of the funniest people ever, he has also run 27 marathons in about a month. Which is completely nuts. It's all in support of a charity called Sports Relief. Here he is in Edinburgh today. You can follow him on Twitter, where he reports things like, "Having some cod and potatoes. Hope my toe heals a bit for Sunday, when I run my 12th marathon" and "Stranraer! 23 marathons completed in 26 days. Body holding together. Lost outer left toenail. Getting used to ice baths. Tomorrow - Belfast."