Man these are so hard to pick! Here's a few for starters, I'll post some more later.
Mr. Garrison
Teaching the kindergarteners about sexual positions (Proper Condom Use)
Revealing "It" (The Entity)
The entire Death Camp of Tolerance episode
Chef
Chef Aid
Singing about prostitutes with James Taylor
--
darkx got banned. :-\
Currently playing: Final Fantasy XIII, NSMBW, Nine Hours, Nine Persons, Nine Doors