The Late Movies: Monsterpiece Theater
Monsterpiece Theater is a Sesame Street segment parodying Masterpiece Theater (which is now known just as Masterpiece). Monsterpiece Theater has been running since 1982; it's hosted by Cookie Monster (actually, Alistair Cookie), and it's brilliant. Although somehow I don't remember seeing this as a kid, there's a TON of awesome Monsterpiece segments on YouTube. Enjoy!
"It don't get classier than this." Featuring Mel Gibson.
Chariots of Fur
It's not often that you see muppet legs.
"Monsterpiece Theater, home of classy drama." Brilliant and weird. "And so end our drama. Me still not know who Claudius."
The Old Man and the C
"That surprise ending get me every time, blow me away!"
1 Flew Over the Cuckoo's Nest
It's not what you think it is.
TONS MORE AWESOMENESS
Wikipedia has a list of episodes, and you can find lots of them on YouTube.