**Billy Bob Thornton's Unexpected Cameo on The Big Bang Theory**
Throughout its 12 season run, The Big Bang Theory had several memorable guest-stars. Among the very top of that list includes Billy Bob Thornton. In the following, we're going to take a look at how his unlikely cameo took place, and what got him on the sitcom's radar.
**Billy Bob Thornton's Condition for Appearing on the Show**
Billy Bob Thornton's Statement About His Mother Loving The Big Bang Theory Got Him On The Show
Looking at his resume, few could've predicted Billy Bob Thornton's appearance on The Big Bang Theory.
Billy Bob Thornton recalls, "I said in an interview that my mom’s favorite show was The Big Bang Theory. So [exec producer] Chuck Lorre got a hold of my manager and said, ‘Would you consider doing a guest spot for your mom?' And I said absolutely, because I’ll do anything for my mom.
Of course, keeping such a debut a secret is not easy task. Steve Molaro revealed alongside The Hollywood Reporter that the plan was to keep his cameo a secret, and not to promote it. However, given that the episode was shot in front of 200 fans, that was a daunting task to keep it a secret. Nonetheless, it appears as though things worked out.
Molaro reveals, "We shot it with the audience. We knew that as far as the promos go, they were going to keep a lid on it but we figured we couldn’t control these 200 people in the [taping] audience, it’s probably going to get out somehow.
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