Sir Bedevere: “There are ways of telling whether she is a witch.
Peasant 1: “Are there? Oh well, tell us.
Sir Bedevere: “Tell me. What do you do with witches?
Peasant 1: “Burn them.
Sir Bedevere: “And what do you burn, apart from witches?
Peasant 1: “More witches.
Peasant 2: “Wood.
Sir Bedevere: “Good. Now, why do witches burn?
Peasant 3: “...because they're made of... wood?
Sir Bedevere: “Good. So how do you tell whether she is made of wood?
Peasant 1: “Build a bridge out of her.
Sir Bedevere: “But can you not also build bridges out of stone?
Peasant 1: “Oh yeah.
Sir Bedevere: “Does wood sink in water?
Peasant 1: “No, no, it floats!... It floats! Throw her into the pond!
Sir Bedevere: “No, no. What else floats in water?
Peasant 1: “Bread.
Peasant 2: “Apples.
Peasant 3: “Very small rocks.
Peasant 1: “Cider.
Peasant 2: “Gravy.
Peasant 3: “Cherries.
Peasant 1: “Mud.
Peasant 2: “Churches.
Peasant 3: “Lead! Lead!
King Arthur: “A Duck.
Sir Bedevere: “...Exactly. So, logically...
Peasant 1: “If she weighed the same as a duck... she's made of wood.
Sir Bedevere: “And therefore...
Peasant 2: “...A witch!