We all like to get an advantage on the house. With a turn of the key the fruit machine will give up it's user information, pay-outs, and how much money is in there.
The Pool table key will give you a free game. They're used when the coins fail to register. Whoever has these keys on his chain is having drinks bought for him. Be a player!
Effective on around 80% of coin-operated fruit machines and pool tables