This exchange is of course adapted from Monty Python and the Holy Grail.
Timothy: When we find our target, how will we know that she’s a witch?
Will she be wearing black robes and have a pointy nose?
Heinkel: It isn’t that easy. But there are ways of telling whether she is a witch.
Timothy: Are there? Tell me!
Heinkel: Think about it. What do you do with witches?
Timothy: Um…burn them?
Heinkel: And what do you burn, apart from witches?
Heinkel: So why do witches burn?
Timothy: Because they’re made of wood?
Heinkel: Good! So how do we tell if she is made of wood?
Heinkel: Does wood sink in water?
Timothy: No! It floats!
Heinkel: What also floats in water?
Yumiko: A duck!
Timothy: So…if she weighs the same as a duck…she’s made of wood.
Heinkel: And therefore?
Timothy: …she’s a witch?
Timothy: Are you teasing me again?
Heinkel: Well done, kid. You’re catching on.