M did this to me once, but on a TDY (so totally different). When he didn't call at his usual time, I got worried and called his phone (it was off because he was on a plane). When I couldn't get through to him for two hours, I freaked and called the hotel. They told me he'd checked out that morning. Just as I was hanging up with them, the doorbell rang. He took a cab home from the airport.
He'll never do it again, (1) because it really scared me and (2) because the cab ride was $50. Also, he was lucky I didn't answer the door with my pepper spray.