50 funniest comedy sketches of all time. I don't agree with a lot of these, but it's cool that somebody did this
http://www.nerve.com/dispatches/nerveeditors/50greatestcomedysketches/01/
it's gonna take a while to watch all these.
watch the david cross "pre-recorded call in show" one, it's really funny
My all time favorite sketch is Chris Farley's Colombian Coffee Crystals switcharoo. The one where he goes totally berserk in the restaraunt. I also like various Dave Chapelle skits. The State, Kids in the Hall, Trigger Happy Television.