11/22/2009 05:12 am ET | Updated May 25, 2011

Ricky Gervais Plays 'C*ck Or Ball' Game (VIDEO)

Ricky Gervais visited Conan Monday night and talked about a game called Offal Jim Jam that he invented while he was sitting around in old pajamas, playing with his balls through the holes in his pants.

"You can play it with you wife or girlfriend or mom, I don't know where you live," he said. "You pull out a little bit of skin, you don't give anything away and you go to your girlfriend, 'Cock or ball?'"

"What the HELL?" Conan shrieked.

"When I invented it I was so proud of myself and I did it on my girlfriend and she got it wrong!" Gervais said.

The British comedian also talked about his new movie, 'The Invention of Lying,' which opens October 2, and plastered Conan's hair to his head with water in order to take the worst possible picture of him.

WATCH: WATCH part 2:

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