Big Lebowski made me laugh a lot, but only in terms of the dialogue. I haven't seen Borat or Caddyshack.
I love Jacque Tati movies and Hulot's Holiday is probably my fave of the lot, but I don't really laugh at them.
Trying to think of some comedies I really liked
and laughed at.
Annie Hall; Manhattan; The Bank Dick (and a few others by WC Fields) ... god I'm really struggling ... there must be some more but I can't actually think of any. Damn, I must come across as being really humourless.
Anyway still the funniest thing I've ever scene in a movie:
https://www.youtube.com/watch?v=wE_2uqCc_K4
I literally can't watch that without almost crying with laughter.