So she starts talking to him. He insists he has an appointment today, and to prove it he pulls out an appointment card. On a crumpled card, in Mary's handwriting, it says "Next appointment: May 27, 2008"
So Mary checks the schedule. Sure enough, he had an appointment on that day. Which, of course, he no-showed. And hasn't been here since.
So we tell him he's a year late for his appointment (which is a record for my practice), and offer to reschedule him (we're swamped today).
So what does he do? He gets pissed off (in front of my full waiting room) that we won't see him today.