Funny Film Recommendations Watch
Don't necessarily have to be funny
all the friday films
don't be a menace in south central
monty python life of brian/holy grail
team america world police
zoolander (i think the only film i've seen where will ferrel is actually funny in it)
this is spinal tap
meet the parents/fockers
off the top of my head..
And like someone else said Pineapple Express.
Ace Ventura: When Nature Calls
Austin Powers (All of them)
I might have more recommendations later.