(I work in a small gift shop that has two doors, one in front and one in back. The front door latches to the outside wall to keep it from swinging shut. One day, a little old lady comes to the back door.)

Customer: “Excuse me, but your front door is locked.”

Me: “Are you sure? I’m looking at it now. It’s open.”

Customer: “Well, I just tried it and I couldn’t get it open.”

Me: “I’m sorry, but it’s open already.”

Customer: “But I couldn’t open it!”

(At this point, it dawns on me that she has been trying to open the door while it was latched to the wall, while ignoring the obviously open doorway to her immediate left.)

Me: “I’m sorry. I’ll look into it…”