I'd say in general that it isn't hard to make me laugh, but some of the stand-up people who make me laugh the hardest are:
Richard Pryor
George Carlin
Bill Cosby
Alonzo Bodden
Paula Poundstone
Dave Chappel
Chris Rock
Daniel Tosh
and Robin Williams for good measure
He can be a bit arrogant, but he was the best part of the Golden Globes.
And if not for him, I never would have known what the Golden Globes were. I wish I still didn't, Gervais was tame up there this year.