Student, clutching a wad of bills in one hand, having just completed a conversation with his buddy about how to buy tickets for the hockey game: Can I go to the bathroom?
Me: No, because you're not going to the bathroom. You're going to buy hockey tickets.
Student: Damn! How do you know that?
Student: Just let me go. I'll be quiet for the rest of the hour if you let me go.
Me: Why should I have to make that kind of a deal with you?
Student: Come on, I really have to go to the bathroom. For real this time.
Me: Don't worry. They'll still be selling hockey tickets when we're done with the notes.