Imagine you are in a subway station with a huge rainstorm pounding outside. You look at a bench and see a wallet, which you pick up and open. Inside is a photo ID for a lawyer, which lawyers use to expedite entry into court houses. No one around looks like the guy. There are also some credit cards and a transit card, but no cash.

Knowing those courthouse IDs are crucial for lawyers, you bypass the transit system lost-and-found and work the Google.com to find the guy the next morning. You contact the relieved lawyer, who comes to pick up his wallet (you haven't taken anything from it).

The man who picks up the wallet is clearly very prosperous. Guys don't often wear custom all-white suits unless they have money for other, normal suits. He says he is a criminal attorney.

As he thanks you, he reaches into his pocket and offers you a cash reward. Do you accept?