“The party and the Krikkit warship looked, in their writhings, a little like two ducks, one of which is trying to make a third duck inside the second duck, whilst the second duck is trying very hard to explain that it doesn't feel ready for a third duck right now, is uncertain that it would want any putative third duck anyway, and certainly not whilst it, the second duck, was busy flying.”

“If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family anatidae on our hands.”

“One is never alone with a rubber duck.”

“If it looks like a duck and quacks likes a duck, it's a duck, right?”

“If it looks like a duck, quacks like a duck, it's a duck!”

“You ever hear that expression 'If it looks like a duck and it quacks like a duck, it's probably a duck'?”

“If it looks like a duck and sounds like a duck, it could be a really ugly swan.”