Rob mentioned it earlier

Cary Elwes The Princess Bride Memoir

, but now there's an article with three excepts, my favourite of which is the third, about his worries during the casting process.

Later, when they were just chatting, they were talking about American television. "I said, 'I love Bill Cosby,' and Rob said, 'You do?' 'Sure I do! I grew up on Fat Albert. In fact, I remember this ..." And then Elwes did a spot-on impression of Cosby's "Hey, hey, hey!" "And Rob said, later on, that was the key, that was the turning point. Had I not done a Fat Albert impersonation, I would probably not be sitting in front of you here today.

This I think I'd read.