The Bridge Toll

A bridge charged a toll. Travelers paid, received a token, and crossed.

One traveler lost his token while crossing. The guard at the far side demanded payment.

"I already paid."

"Prove it."

He couldn't. He paid again.

A better system gave travelers a mark on their hand — visible, indelible for the day. Pay once, cross as many times as needed. Try to pay again, and the toll-taker would simply wave you through.