Leela: Wait a second! There's a microwave radar dish at the army base. We could steal it!
Farnsworth: No! That would alter history. Above all else, it is our sacred duty to preserve the past exactly as it was.
Fry: Well, I killed my grandfather.
Leela: Wait. If you killed your grandfather, why do you still exist?
Fry: I dunno. Maybe God loves me.
(Bender laughs hysterically)