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Thornton was nervous about Big Bang Theory cameo

Billy Bob Thornton
Billy Bob Thornton

Billy Bob Thornton has revealed that he was very nervous about filming an episode of The Big Bang Theory because he hadn't been involved in a sit-com "in, like, 20 years."

The actor appeared on an episode of the US Late Late Show, which was guest hosted by The Big Bang Theory's Kunal Nayyar and said: "My mum watches it religiously, that's her favourite show.

"So when Chuck Lorre asked me, he said 'Hey, look, I know this is your mum's favourite show. If I wrote something insane, would you come and do a guest spot?' I said, 'Absolutely'."

Speaking about his nerves ahead of filming Thornton said: "I was so nervous doing it because I haven't done that kind of show in, like, 20 years.

"I haven't been on a sitcom like that... I get to the set and it's like, 'Oh, the veteran film actor's here, everyone's gonna be nervous [around him]' and I was the one who was nervous! I kept asking... 'What are all these cameras? What do you do? Where do you stand?'"

See a clip Thornton on The Big Bang Theory here:

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