(I work as a cashier at a well-known arts and crafts store. This particular day, it is raining very heavily, which is rare in Arizona.)

Customer: *walking over to myself and other cashier* “Excuse me, it is wet outside. I almost slipped.”

Me: “Sorry about that, ma’am. Are you okay?”

Customer: “Yes, but you need to put a wet floor sign outside so people are aware that it is wet.”

Coworker: “It’s raining, ma’am. I think people know the ground will be wet.”

Customer: “No, they won’t! Because I didn’t!” *storms out the store*