There's a couple of movies that, when I was a teen and was able to watch movies late at night, I thought were hysterical:
What's up Doc?
Start the Revolution without Me
Both of which are clean. StRWM seems like it's gonna get nasty at times, but always cleverly avoids doing so. I think they're both underrated. When I was in college they used to show old movies for a buck and What's up, Doc? was always a packed house.