Fry: Dammit, we'll have to fix the engine ourself.
Leela: We can't, you bastard! No one knows how it works. It's impossible!
Cubert: Nothing is impossible. I understand how the engines work now. It came to me in a dream. The engines don't move the ship at all. The ship stays where it is and the engines move the universe around it.
Bender: That's a complete load.
Cubert: Nothing's a complete load. Not if you can imagine it. That's what being a scientist is all about.