A Duck

Sorry, everytime I see a Duck can't help but think of that Monty Python sketch from the Holy Grail and the wise Arthur, King of the Britons.

Does wood sink in water?
- No, it floats. - Throw her into the pond!
- What also floats in water?
- Bread. - Apples.
- Very small rocks. - Cider! Great gravy.
- Cherries. Mud. - Churches.
- Lead. - A duck!
- Exactly.
- So, logically--
- If she weighs the same as a duck...
- she's made of wood.
- And therefore?
- A witch!
- A duck! A duck! - Here's a duck.

- We shaIl use my largest scales.
- Burn the witch !
- Remove the supports!
- A witch!
- It's a fair cop.
- Who are you, who are so wise in the ways of science?
- I am Arthur, king of the Britons.