Big Bang Theory Quote
Sheldon: (about Howard's robot arm) Impressive, but we must be cautious.
Howard: Why?
Sheldon: Today, it's a Chinese food retrieval robot. Tomorrow, it travels back in time and tries to kill Sarah Connor.
Leonard: I don't think that's gonna happen, Sheldon.
Sheldon: No one ever does. That's why it happens.
Quote from S04E01 - The Robotic Manipulation