(A sharply-dressed man comes to the counter with a woman of his age and a five-year-old kid walking near them.)

Me: “Can I help you, sir?”

Man: “Yes, can you tell the price of those books, please?”

(He hands me a list, and I use it to calculate the total price of the books in question.)

Me: “Okay, the total comes to $242.14.”

Man: “All right. Do you take debit cards?”

Me: “Excuse me?”

Man: “Ten years ago, when I was a teen, we stole those books in your shop with my wife here as a student prank. Now that we both have a good job, we want to show my kid that you must fix your errors in life.”

(I stayed speechless for a good minute before taking his payment. If there’s a “Customer of the Month” award, this family takes the cake!)