Most movies from Adam Sandler or Chris Rock. They're just totally hilarious. They're my favourite actors (in the comedy area).
Their latest one, Grown Ups, is freaking amazing. Featuring Adam Sandler, Kevin James, Chris Rock, Rob Schneider and David Spade (you probably recognize all their faces, have a look here: http://www.worstpreviews.com/images/grownups.jpg
Sadly, I haven't got a chance to see it yet, but I will be watching VERY soon. I can't wait.