Watch Kaley Cuoco Totally Nail The Big Bang Theory's Theme Song

The Big Bang Theory's Kaley Cuoco was a guest on Wednesday's Tonight Show to promote the show's upcoming Season 10 finale, the 231st episode of the series.

At the end of her interview, she and Jimmy Fallon took questions from the audience, and someone asked her if she knows all the words to the

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• The Tonight Show Starring Jimmy Fallon
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