Sheldon Cooper compulsively knocks exactly three times
Because nothing says relatable roommate like a man who will relentlessly hammer on a door until his arbitrary numerical ritual is complete. Sheldon's knocking habit is framed as a quirky character trait, but in any realistic scenario, it would result in immediate eviction or a restraining order. The sitcom universe is wildly forgiving of borderline hostile obsessive-compulsive behaviors.

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