I'm conducting sax sectionals for one of my high schools this week, and the room I'm using is on the second floor on the other end of the building, farthest from the band hall. The route that several students and I chose to go back was probably brand-new to me...
ME: This is interesting; I don't think I've ever been in this part of the school before.
KID: This is the upstairs.
ME (laughing, along with the other kids): Thank you, Captain Obvious.