What are your opinions of the funniest movies of all time?

It's a hard choice, but these two scenes stood out in my mind:

http://www.youtube.com/watch?v=Y_GJkKMPHxw
Leslie Nielsen's second slap made me lol for like 5 minutes for some reason.

http://www.youtube.com/watch?v=0LpOm...eature=related
This captain is my hero! I hate solicitors too