Pray For His Bladder

(On a road trip with a friend, we both find ourselves in need of a restroom. My friend has an especially urgent need, since he had a large soda with lunch. After several more miles, we finally spot a service station. We exit the highway, pull into the station, and make a beeline for the men’s room. After I finish, I go over to the sink to wash my hands, but I see that my friend is still at his urinal.)

Me: “Hey, aren’t you done yet?”

Friend: *not looking up* “Didn’t you see the sign outside? With eight gallons, you get a free car wash!”