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12 Best The Big Bang Theory Quotes from The Hot Tub Contamination (10x05)

Quote from The Big Bang Theory 10x05 Sheldon Cooper: When I opened the door, I saw my father having relations with another woman. Penny Hofstadter: Oh, that's awful! Sheldon Cooper: I know. It's also why I never open a door without knocking three times. I mean, the first one's traditional, but two and three are for people to get their pants on.

The Big Bang Theory casts does a quick "Call Me Maybe" flash mob, followed by Sheldon, of course, saying "Bazinga."

Random Funny Pictures Of The Week

I hate this show. But 37 and 73 are my favorite numbers and Sheldon just explained why.