I saw a guy make a great seat play on a 757 the other day. He was seated at 26A, on the window, surrounded by a family group in seats 26 B and C and ahead of him in seats 25 A and C with the middle seat vacant.
He gallantly offered to switch seats so that the family could sit together.
He moved ahead one row and scored a window seat with an empty middle seat.
Bravo! Had he managed to get the aisle seat, I would have pinned a medal on him.