(Our bar has been reserved for a private party. Signs are up all over the place, on fluorescent pink paper, including on the front door, right at eye level. A customer approaches the bar.)

Me: “Hi…I’m sorry, but the bar’s closed to the public tonight as there’s a private function taking place.”

Customer: “Well, I didn’t see the sign on the door!”

Me: “So…how do you know it’s there?”

Customer: “…”