Big Bang Theory Quote
Sheldon: Your check engine light is on.
Penny: Mm-hmm.
Sheldon: Typically that's an indicator to, you know, check your engine.
Penny: It's fine, it's been on for, like, a month.
Sheldon: Well, actually, that would be all the more reason to, you know, check your engine.
Penny: Sheldon, it's fine.
Sheldon: If it were fine, the light wouldn't be on. That's why the manufacturer installed that light, to let you know it's not fine.
Penny: Uh, maybe the light's broken.
Sheldon: Is there a "check the check engine light light"?
Quote from S02E05 - The Euclid Alternative