Understated stand-up Mark Watson retired from doing these ridiculously long marathon shows a few years ago, after completing multiple 24-hour gigs and even a 36-hour extravaganza. But when Comic Relief asks you to stage another for their its anniversary, you don't say no. Watson's back with this 25-hour interactive gig, where the comic will perform for the full day-and-a-bit while other people in the Pleasance and across the country attempt their own 25-hour challenges. Watson's endurance shows are always loads of fun, and normally involve a heap of brilliant comics helping in any way they can. Take Friday off work, bring coffee and prepare for a brilliant bizarre 25-hours.