[zen_of_prog]

I would think the weight would play a much greater role than the material. The Sea Witch would have to be pretty light, since a witch weighs the same as a duck.

[girvo]

I thought witches sink rather than float, though?

[askvictor]

Nah; that's how you tell they're witches. If they sink, they're not witches. If they float, they're witches and must be burned at the stake. Flawless logic.