I like to think that there are a whole host of scientists
measuring how fast water runs off a duck's back.
(
JessAction Give me all your expensive brandy and hubcaps., Fri 29 May 2009, 0:19,
archived)
they just run water over a witch's back,
and assume it's the same.
(
Moon Girl Technologies horrendous beanbag, Fri 29 May 2009, 0:20,
archived)