Why didn't you do this part? That's extra credit, you don't ha...
Alan [about Jake's homework]: Why didn't you do this part?
Jake: That's extra credit, you don't have to do it.
Alan: Why don't you do it anyway?
Jake: Because I don't have to.
Alan: But it shows that you're willing to make an extra effort.
Jake: But I'm not.
Alan: Do it anyway.
Alan: Jake, if you spent as much time doing the work as you do arguing about it, we'd be done by now.
Jake: I am done, this is the extra!