This happened to me a few years back. I pulled over to use a pay phone and my wife decides to use the bathroom. I didn't hear her get out, and the payphone didn't work. I got in, told her I was driving across the street to the supermarket to use their pay phone. I got over there, got out and realized she wasn't there. To make her suffer more, I decided to take my girls in, take them potty, make my call and then go back to get her.
She was more afraid than mad, as we here about 2 hours from home. Never again will she sneak out without telling me.
