I flew EWR-MAD on Aug. 17. I had prebooked an aisle seat. When I got there, a Spanish man tried to usher me into the middle seat (as if he were doing a courtly `after you' gesture). He showed me his boarding pass. I pointed out that E was the middle seat. He still hemmed and hawed, but finally took it (but also tried to get the aisle seat of the woman in G, who likewise refused him). After that, I was somewhat worried that if I dozed off, he might try to get into my purse. I noticed he didn't try to get the aisle seat of the man next to him.