Knock Knock Knock Penny, TBBT Men's T-shirt
Dr. Cooper has this peculiar door knocking ritual.
(knock, knock, knock) "Penny?"
(knock, knock, knock) "Penny?"
(knock, knock, knock) "Penny?"
Sheldon also has this obsessive compulsive tendency to finish his 3 sets of knocks even if Penny had already opened the door.
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