Pot-Tea Mouths

B: I've got a riddle for you. A man is leaning over a stove to change a lightbulb, and his watch falls off and falls in a teapot. When he reaches in to get it, the watch is dry. Explain.
F: Hm...is it Chinese tea?
B: Uh, yeah.
F: Well, then, the watch was dry because all the water had boiled away from being in the pot-'oolong.
J: Oh, come on. That's not right. The water couldn't have evaporated. Don't you know that a watch'd pot never boils?