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?

Timothy: Wood?

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?

Timothy: Uh…

Heinkel: Does wood sink in water?

Timothy: No! It floats!

Heinkel: What also floats in water?

Yumiko: A duck!

Timothy: Ooh!

Heinkel: Exactly!

Timothy: So…if she weighs the same as a duck…she’s made of wood.

Heinkel: And therefore?

Timothy: …she’s a witch?

Heinkel: Exactly.

Timothy: Are you teasing me again?

Heinkel: Well done, kid. You’re catching on.