It used to be one of the best-kept secrets from the show, but it turns out that Penny's last name may have been revealed pretty early on in Big Bang Theory.
Now, all the best sitcoms out there need to have that one mysterious joke tying the show together - from Scrubs not revealing the Janitor's name until the last episode to Friends hiding Ugly Naked Guy's face.
For the iconic sitcom The Big Bang Theory, the mystery surrounding Penny's last name has continued to keep viewers intrigued long after the final episode aired.
However, one eagle-eyed viewer has revealed that the show had already slipped the answer under our noses early on, leaving fans astounded.
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