George Carlin, until about the middle-eighties.
Rip Taylor--don't make me explain, the dude just makes me laugh hard.
Kevin Meany
Sarah Silverman--I expected to hate her, but her line about the movie 300 had me choking with laughter, and then her bit about Joe Franklin got me for good.
Richard Pryor--just brilliant.
My #1 pick has to be Rodney Dangerfield. His gimmick--that he was a loser, and the jokes were at his expense--was kind of the reverse of Don Rickles (who I found funny until I was about 10, then for some reason he didn't make me laugh anymore). On one of his records, the laughs just keep coming until the audience applauds, as if they just need him to stop talking so they can get their collective breath back.
I've seen some of the current crop who are supposedto make me laugh, and with the exception of Silverman, they don't.
Rip Taylor:
"What do you get when you cross and elephant with a rhino?
Elifino!"