Patron: Where's the bathroom?
Me: It's right downstairs, next to the water fountain.
Patron: Where are the stairs?
Me: Um. Right behind you.
Patron: Oh, those.
Me: Yup. The same exact set of stairs that you just climbed to get here.
(Luckily, she was very nice about it. I was having a bit of a snark and it just popped out.)