Schrödinger’s Cat Wanted

Who remembers this exchange in one episode of The Big Bang Theory?

Sheldon: What do I have to say to bring this discussion to a speedy conclusion?
Leonard Hofstadter: Tell me whether or not I should go out with Penny.
Sheldon: Schrodinger’s cat.
Leonard Hofstadter: Wow, that is brilliant!
Sheldon: You sound so surprised.

Via George Takei