A: Remember to put air in your tires. B: How often do I have to do that? A: Once every two months. B: That's a lot. A: What do you mean? B: That's six times a year! A: Yes, and it takes about five minutes each time. B: I'll try. A: Check your tires or you'll get a flat. B: Oh. That's not good. A: No, it isn't. A flat costs you time and money. B: And I don't have either.