Without a doubt Robert Schimmel........He does a bit about mike tyson and evander holyfield.......Goes something like this....Evander Holyfirld says he wouldn't fight Mike Tyson again for 20 million dollars (after the ear bite fight)......Schimmel goes "for 20 million dollars I'd suck mike tysons cock at the thanksgiving dinner table with my mom watching." Not nearly as funny as when he does it... man he is a howl

So many people make me laugh out loud.  One used to post on this very Discussion Board.  But those who come immediately to mind are Robin Williams, Jonathon Winters, George Carlin, Steven Wright, Rodney Dangerfield, Buddy Hackett, Alan King, Don Rickles, Abbot and Costello, the Marx Brothers, and the list could go on endlessly.  Funniest skit or routine, also many:

Abbott and Costello;  Who's on First?
Buddy Hackett's monlogue on how he proposed to his wife (trying to look romantice by bringing a tear to his eyes by trying to pull out a nose hair)
Almost any George Carlin monologue about vocabulary or societal conundrums.
Any stand-up routine by Robin Williams.

Man, I love Robert Schimmel too.  The other guys that top my list are:  Richard Pryor, Lenny Bruce, George Carlin, Eddie Murphy, Bobby Slayton, Richard Jeni and Chris Rock. Of course I can't leave out Bill Hicks.  Not many people know about him but he was hilarious.  Thought provoking too.

My favorite bits are pretty much anything from Richard Pryor, George Carlin or Bill Hicks.