(I was working on the theater’s ticket-selling system. It printed every ticket using a thermal printer, on paper that gets black in spots where it is heated. A customer comes in with a completely black ticket.)

Customer: “I want this ticket replaced! What kind of tickets do you sell?! I can’t see anything on it!”

Me: “I’m sure we didn’t give you this ticket in this poor state. What happened to it?”

Customer: “It got all bent in my purse and looked ugly, so I ironed it.”

Me: “But ma’am, this ticket is printed on a thermal paper. It gets black when heated, so–”

Customer: “You should’ve warned me that I can’t iron the ticket!”