Bill Cosby sucker-punched Tommy Smothers at the Playboy Mansion in 1976 after Smothers criticized the Cos for not being outspoken enough on civil rights issues. Weird:

In October of 1976, Cosby and Smothers were attending the same party at The Playboy Mansion. Hoping to ease some of the tension, Tom congratulated Bill on his latest television series. What Smothers did not realize was that the show in question had been cancelled the day before. "I liked your show," said Tom, "it was a really good effort." Cosby didn't respond. "He just looked at me [as if to say] 'Fuck you,' and I said, ' Well, Fuck you.' ... and walked away. I'd been getting this kind of thing from him for a long time. It started when he was hosting The Tonight Show. He had this kind of dismissive way of introducing people ... and I nailed him - you know, comedic oneupmanship---and I remember he said, 'Maybe sometime I'll knock you upside the head one of these days,' and I said, 'Yeah, go ahead and try.' A couple months later ... boom ... there it was. I should never have turned my back on him. He didn't have the balls to do it when I was looking. He slipped behind Hefner and sucker-punched me. He hit me right in the head with his fist - knocked me down ... and I was down there a minute or two and he was standing over me screaming at me, 'C'mon, I'll kick your ass,' stuff like that. I've never seen him since then. I always thought, maybe if he turns around sometime I might give him a shot."