My favorite flying story from flying for over 40 years.
I was on a smaller plane (2X2) about 20 rows (80 seats) going from Atlanta to Charleston West Virginia. We were all on the plane and I had an aisle seat with the window seat open. There were no more than 15-16 passengers on this plane and there were 4 vacant rows behind me. I decided to slide over to the window.
Just before they could close the door for this marvelous 55 minute flight, on comes hard boiled business woman onto the plane. She proceeds to my row and proclaimrd to me that the window is her seat, ignoring the fact that there are 8 window seats open behind us with no one sitting in the aisle seat and she's the last person on the plane. I asked her since I was settled if she could just take one of the other seats and her response was: "No, get your ass out of MY seat". She then summoned the flight attendant to let her know that I was sitting in her seat. The flight attendant asked her to take one of the other seats and she again refused and pitched a fit.
I, being the kind and considerate person that I am, then relented and said "OK ma'am, I'll move so you can have your assigned seat. She actually said "about time". I got up and she sat down, then I proceed to plank my fat ass in the seat next to her. She was shocked and asked me why I wasn't taking a seat in another row, and I informed her that this seat is MY assigned seat. I road next to her the entire trip. The flight attendant laughed which pissed her off even more.
What a great day!