62. Quarters Machine
"We can use vending machines as quarters machines!" I told Ms. Diver happily, after once a vending machine refunded me four quarters for the dollar I had inserted in a sold-out situation. "All I need to do is to insert some paper dollar bills and then ask for the refund."
Finally, I remembered to give it a try some time later. As it turned out, annoyingly, the refund button did not work this time and I had to buy a soda in order to get the rest of the money back, although I was not thirsty at all.