Lots of my friends used to listen to Cosby when we were kids, had his records, thought he was the funniest comic going. A few years ago I saw some old videos posted on youtube. I was really surprised to see how ANGRY he was while going through his routines. He seemed to be boiling over mad. Really disappointed me, I thought I had found something worth watching, but after one, well, that was enough. What a shame, he has really spoken well for people taking responsibility for their actions.
On phonograph records you could not see his face.
Maybe he was trying to purge himself of irritations in his life through joking.