You dump the piggy bank into CoinStar, and when you cash in the receipt, you get coins back! That's irriating, as the point of this exercise was to empty the piggy bank. But, if you just cycle the change back through the machine, all those coins just vaporize into service fees after less than 80 passes. (That is, assuming they round by truncating in their favor; if they round fairly, it stabilizes at 5¢ without a fee.) So that's no good, either. The trick is to cash in the bank when you have exactly the right amount to come out with an even-numbered cash-out. But that requires counting it first, which is something of a catch 22.
Current Music: INXS -- Face the Change ♬