This cracked me up! :D
(A customer who has just made a purchase comes back into our store asking for help; she’s locked her keys in her car. I go out to try and help.)
Me: “Ma’am, your window is open.”
Customer: “What?”
Me: “Your window. It’s open.”
(The customer reaches in and gets her keys, opens the door, rolls up the window, locks the car, throws the keys back inside, and closes the door.)
Me: “Um…”
Customer: “I know! I know! It’s just that I already called my husband to bring the second set! He’d have given me h*** if he saw the window was open!”
--via Not always Right