A Penguin That Prefers His Fish Cooked Waddles On A Slippery Slope

The translation of a Swedish proverb to mean not to dwell on things that cannot be

Jack: So I've been putting a lot of thought into it and I think Jessica and I would make a great couple!

George: Come on Jack, remember what dad always told us: "A Penguin That Prefers His Fish Cooked Waddles On A Slippery Slope." You know you have no chance with Jessica, stop obsessing over it.