On a flight from San Diego to Seattle, when I got to the aisle seat I had reserved months before a burly man was sitting in it. I said nothing, but turned around and found a stewardess (they were stewardesses then) and let her know.
We went to the guy, she checked our boarding passes, and told the guy he had to move to his assigned seat — the middle seat. He refused. Things got nasty, but he did move over.
Then he did major “man spreading”, and put his knees halfway over into my space, and kept elbowing me. A guy across the aisle noticed it and called the stewardess again. When she got there, he made a definite threat to her.
She went forward and came back with the Captain or Co-pilot. (We still were on the ground.) He told the guy he had choices. He could get off before takeoff. He could behave the rest of the trip. Or he could stay on board and not behave. If not, he’d be handcuffed to the seat and turned over to the police in Seattle. I didn’t know they had handcuffs on board but I guess they do.
I suppose he behaved. The stewardess moved me to an empty aisle seat in the front for the trip.
I had a fat man in my row in first class that appropriated his rolls of fat into my side of the seat - basically cutting off half of my paid for seat. I called the stewardess over and she just immediately got him out of that seat and moved him to an empty row back in about row 28. He cried like a little baby but he was a dirty and smelly 400 pounder.