That torpedo did not self-destruct. You heard it hit the hull. And I... was never here. (idea)

James Earl Jones' famous line from "The Hunt For Red October". Used as a gag amongst certain movie-enlightened folks when doing something sneaky.

"Hey, what are you doing?"
"Nothing. I am not putting a whoopee cushion on your desk chair. That torpedo did not self-destruct. You heard it hit the hull. And I... was never here."

See also These are not the droids you're looking for.