The technically correct response to number two is 'albumen'. (Q: What do you call the white of an egg? A: The white! is rather redundant, eh?)

Even if you don't trip them up, you can sting them with this technicality, because no one knows the word albumen... except, apparently, me.
Azure Monk runs off to hide in a hole.

Anyway, here's another one:

Ask them to say 'silk'.
Ask them to spell 'silk'.
Ask them to say 'silk' three times.
Ask them "What do cows drink?"


The answer, of course, is water.