According to Sheldon, which is the Secret Knock in the episode "The erdnuss Reaction" (S1 E16)? - The Big Bang Theory Trivia Quiz

Big Bang Theory Pop Quiz

According to Sheldon, which is the Secret Knock in the episode "The erdnuss Reaction" (S1 E16)?

Choose the right answer:

Knock - knock knock - knock knock

Knock knock - knock knock - knock

Knock knock - knock - knock knock

Knock knock - knock knock knock

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