Season 9, Episode 17: "The Bookstore"

Yes, I need to return this book.

I'm sorry, we can't take this book back.

-Why not? -It's been flagged.

-Flagged? -It's been in the bathroom.

It says that on the computer?

Please take it home.

We don't want it near the other books.

Well, you just lost a lot of business because I love to read.