In "The Cognition Regeneration" episode of "The Big Bang Theory," Bernadette surprises everyone by showing off her talent as a ventriloquist with a creepy dummy named Tammy Jo. While it's unclear if Melissa Rauch, the actress who plays Bernadette, actually threw her voice for the performance, there are clues that suggest she may have learned ventriloquism at some point in her career.

Rauch has a background in comedy and theater, having performed stand-up and written sketches before landing her role on "The Big Bang Theory." Despite fans' curiosity, the mystery of whether or not Rauch performed Tammy Jo's voice remains unsolved for now.