I'm going to pre-emptively call out bad behaviour on the person who booked a preferred middle seat beside me for my flight on Monday morning, as opposed to taking anyone of the multitude of empty aisle or windows, or for that matter, empty rows, further back. You'd really rather be jammed into 12B/E and irritate your seatmates for the extra 2" of legroom than have an aisle or middle seat somewhere in row 20-25? With any amount of careful planning, you'll get at least an empty middle beside you. But now, I get to deal with you instead.
Seriously, who does this? The flight is nowhere near full.
And yes, I am entitled and self-centred. And became very comfortable with both those facts a long time ago, so no need to point them out to me...