Catholic School Girls in trouble was KFM.  In the sex scene in the shower, the use a sound effect of a squishing balloon as her breasts are shoved against the glass door.  Its just amazingly funny
Then there's Stan Jarowski:  Jewish Dare Devil.  A little guy (like Rick Moranis from Ghostbusters) walks over to a bunch of big black dudes wearing a running suit and a crash helmet.  He yells "N****ERS" and runs like hell.
The whole movie is loaded with a bunch of great skits
One more...
Ever see the talk shows where they bring am animal from the zoo to visit?  On KFM, the have a big gorilla...they talk about him, then ask about breeding.  When they say "impotent", he goes nuts and tears apart the studio....oh jesus, I'm laughing like a loon now while I type this...hehe