Two friends Jack and John go to the bank, when armed robbers burst in.
While several of the robbers take the money from the tellers, others line-up the customers, including the two friends, up against a wall and proceed to take their wallets, watches, and other valuables.
While this is going on Jack jams something in John’s hand.
Without looking down, John whispers, “What is this?”
Jack replies, “It’s that $50 I owe you. “
This joke is included in the Black Book of Jokes. You can order it from here.