arsenic & old lace. i think i hate everything else frank capra did, or at least everything else that i saw that he did (yes, that means i hate 'it's a wonderful life'. i do, i really can't stand that movie, and i might put a boot through the tv if i ever have to see it again). but cary grant kicked ass in it, and it's just really funny anyway.
and also based on a play,of course...i really like both the 1952 and 2002 versions of the importance of being earnest.
...pretty much any monty python...office space...
i watched dodgeball last night, that made me laugh....
rushmore, the royal tennenbaums, and bottle rocket rule
this is a quite difficult question. i quite enjoy laughing.