You are at the grocery store buying a couple items. Your total comes out to $13, you hand the cashier a $20 dollar bill. The cashier hands you your change and you start walking to the door. Before you leave the store you realize the cashier made a mistake. She handed you a $5 dollar bill, 2 $1 dollars bills, and your $20 dollar bill on the bottom. She accidentally gave you back your money you used to pay and the change. What would you do?

Option A. Return the money to the cashier and let her know she made a mistake.

Option B. Keep the money, it’s your lucky day!