It's nice to try to be trustworthy.
Bill is sitting at a coffee shop when another customer asks him to watch their things which includes a purse with money inside.
Bill wants to leave the coffee shop.
Bill watches the customer's things until they return then leaves the coffee shop.
Bill takes the money from the purse then quickly leaves the coffee shop.
The customer is relieved that they put their trust in somebody honorable like Bill.
The other customer feels stupid for trusting a stranger and misses the money Bill took.