Kaley Cuoco and Jim Parsons in The Big Bang Theory (2007)
Knock, knock, knock, Penny - Knock, knock, knock, Penny - Knock, knock, knock, Penny ... Knock, knock, knock, Penny - Knock, knock, knock, Penny - Knock, knock, knock, Penny ... Knock, knock, knock, Penny - Knock, knock, knock, Penny - Knock, knock, knock, Penny
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