Somewhat related, but those of you who went to UConn in the recent-ish past should get a kick out of this. My first two years, I lived in Alsop (The International Dorm!), and because I was a fatty fatty fat fat, I would go down to the vending machine in the study lounge to get candy pretty regularly. Because someone is deranged, a Snickers bar was $1.10. However, a Twix was only $.75, so if I only had a single, that's what I'd go with. That was the case on this fateful day, so I went down I put my dollar in, and I selected the Twix bar. But then something weird happened. Right as I hit the button for the Twix, it rejected my dollar, but still delivered the Twix.
Bonus, I thought. Free candy. But that's not where our story ends.
I looked at the little screen, and it said "Credit: $50.00." Now, I'm no big city lawyer, but I thought I knew what that meant. So my first instinct (remember: fatty fatty fat fat) was to now try for the Snickers. Denied. It said to use exact change. My plans were foiled, and there was nothing left for me to do. On a lark, I hit the coin return button.
Holy crap.
The machine immediately went insane, and started spitting out money. Initially, it was those gold dollar coins, and when it ran out of those, it was quarters, then dimes, and finally nickels. When it ran out of nickels, I could still hear the mechanism spinning in there, trying to dump more money on the floor. Because I was 19 and had no morals, I began stuffing coins in my pocket as fast as I could, and then I ran the hell out of there, $72 richer (which I know is weird, since it said $50 credit, but I don't know what to tell you about that).
Anyway, that paid for candy snacks for the rest of the semester, which I suppose was a fitting punishment.