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Sheldon pays a surprise visit to his mother and sees her having sex through the window. He doesn't handle it well. He eventually accepts it with Howard's help.

At home, Raj plans a murder mystery party, but it's a bomb. No one has any fun. It causes disagreements between Penny and Leonard over their future.

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The Big Bang Theory Season 7 Episode 18 Quotes

Mrs. Cooper: Shelly! I'm so glad you're here!
Sheldon: I saw you having naked sex.

He has a very sensitive butt. Well, it's true. I once saw him sit on a bunch of loose change and add it all up.