Whose line is it anyway? has to be one of the best sketch comedy shows on since i've been alive (early 80's). They had a great cast, and they kept things fresh enough not to make the show boring. The show originated in Britain back in 1988 and when it went off the air ABC picked it up for North American consumption. I've added a few videos from youtube that I've enjoyed. It's pretty tough to find a clip that isn't somewhat enjoyable. It's too bad the show is off the air.
Scenes from a hat
If you know what i mean...
Richard simmons in 'Living scenery'
Robin Williams as a quest star
Best of "scenes from a hat"