A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.

[repeated line when someone accuses Sheldon of being crazy]
Sheldon: I'm not crazy. My mother had me tested!
[repeated line when Sheldon tells a sarcastic joke]
Sheldon: Bazinga!
[repeated line when Sheldon knocks on Penny's door]
Sheldon: [Knock-knock-knock] Penny!
[Knock-knock-knock]
Sheldon: Penny!
[Knock-knock-knock]
Sheldon: Penny!
Sheldon: You're not done with her, are you?
Leonard Hofstadter: Our babies are gonna be smart and beautiful.
Sheldon: Not to mention imaginary.
Penny: So, what do you say Sheldon, are we your X-Men?
Sheldon: No. The X-Men were named after the X in Charles Xavier. Since I am Sheldon Cooper, you will be my C-Men.
Howard Wolowitz: [as Sheldon walks away] Oh, that's not a good name.
Penny: Look, Sheldon's hugging me!
Leonard Hofstadter: It's a Saturnalia miracle!
[repeated line]
Penny: Holy crap on a cracker.
Leonard Hofstadter: [after a motorcycle accident, which no one asks him about] My leg is killing me, thanks for asking.