A few years ago I was ask to move two seats over from the aisle because another passenger was going to be seated in my ticketed seat. Not a big deal unless you have a physical disability that prevents you from walking. They brought folks on to reseat me. A everyday looking guy sat in my seat and that was that...
One of my favorite flight memories: I was in my ticketed seat waiting for everyone to board when a very loud entitled woman made a scene claiming I was in her seat. A very nice flight attendant said “no problem” and asked me to come with her. She put me in a great seat in first class.