A: Yesterday you accidentally picked up a wallet with thousands of dollars on the street. Tell your friend what you did with the wallet and ask your friend what he/she thinks about your action. Then ask him/her what he/she would do in that situation. Why?
B: Your friend is going to tell you a story. Tell him/her your opinion about his/her action. Then tell him/her what you would do in that situation. Why?
Then change the role. B tells A another story. A gives opinion.