Magician: Now, ladies and gentlemen. I mix the eggs in this gentleman’s hat, and the result is an appetizing omelet. Any kind of eggs would do as well as these I use. I do not encourage an audience to bring eggs with them, as they might be tempted to throw them rather than wait for me to ask for them. But. as I said before, any kind of eggs would do.
Voice from gallery: I know one kind wouldn’t do.
Magician (surprised): What kind is that?
Voice from the gallery: Hard boiled ones!