Two men are in a bank when armed robbers break in.
One robber rushes the teller windows, one guards the door and the third bank robber stands in the middle of the bank and yells, "Right! Everyone up against the wall and empty your pockets. We want valuables, watches, and wallets."
The first man jams something into his buddy's hand.
"What's this?" asks his friend without looking down.
"It's that $100 I owe you," answers his friend.