Stop in for a cup of coffee

The wife has to go to a medical appointment and will be gone a couple hours. I'm thinking great I have a couple errands to run. Before she leaves, she tells me that I'm supposed to take it easy and not do anything but nap or watch tv. Sure, I replied. Oh, here's this and hands me a slip of paper. I look and it's the mileage off my car. WOW!! I'm a prisoner!!