With a bill of any denomination, the barcode on the the bill represents a poker hand. The best five numbers/letters or combination of the two wins. The best hand is AAAAA. This game obviously works the best not having seen any of the bills. Some people play with rounds of betting revealing a little something more about their bill/hand each round.
Jim - Hey you little chug, got a bill?
Bill - No.. I got some change.
Jim - You shouldn't have bought the lysol so we could've played Indian Poker.
Bill - Next time.
Jim - Ya, next time.