And so it does. That reminds me- There's a Trappist monastery in my neighborhood, and the cloistered nuns run a dairy there and sell all sorts of goodies (candy, jams, bread, cookies, Havana cigars). They're not supposed to converse, of course, or be seen, but one nun has permission to talk to customers through a kind of revolving barrel set in the wall. She spins it around, you put your money in, and she spins it back. Invariably, when you put a twenty-dollar bill in for, say, a five-dollar purchase, she says "Thank you" and returns to blessed silence- and the barrel doesn't spin back.