How old? Because my 13 year old loves the box sets of The Inbetweners and Skins, but they really aren't suitable for 13 year olds . His older brother has them and I didn't realise he had watched them [bad mother emoticon].
He has also recently seen The Hangover and Stepbrother and lots of Family Guy.
His most recent favourite type of film are horror skits, like Sean of the Dead. He has a couple of those - if your son likes joke horror I can ask him the names. They are mostly 3 quid Tesco ones.