To be fair, I've read telling 'The Aristocrats' "joke" is in the delivery but I still fail to see how a good many of those "jokes" could be funny. Trying to get laughs by being shocking or outragous just seem to get sad very quickly.
I've got about 4 or 5 of Bill Cosby's old comedy albums- 'Why Is There Air' and 'I Started Out As A Child' are two of them. FUNNY, funny stuff. Weird thing though, he doesn't curse or tell jokes about incest. He must be considered passé among the comedians of today...