Can I borrow your class notes from yesterday's lecture? Heck no! You're so lazy. What are you talking about? I was sick yesterday. I don't care. Ask someone else. You're so mean! I can't let anyone borrow my class notes. Why not? They're just notes. I let a classmate borrow my notes once, and she sold copies to people. That's crazy! For how much? She sold each class note set for $5. Don't worry, I promise not to sell your notes. I can't take your word for it.