After wheeling out Alan Carr: Tooth Fairy Live for what's probably the fourth time this year (10.00pm, obviously to whet our appetites for his new show, Chatty Man, which airs tomorrow night), Channel 4 will then throw on The World's Greatest Stand Up, again. Hey, at least it features a flurry of A-list comedy names. It was recorded live at one of the world's largest and most prestigious comedy events, Just for Laughs from the International Comedy Festival in Montreal, with hilarious performances from Lee Evans, Dara O'Briain, Dave Chappelle, Denis Leary, Dylan Moran, Omid Djalili and Tim Allen. It's probably repeated within an inch of existence due to the wealth of talent on display, with performances from an eclectic extravaganza of the hottest talent from the UK, Ireland and North America. O'Briain's segment is particularly funny, and we're not just saying that, honest.