Originally Posted by lost_in_translation

To me, this is just strange and there's no legislating for the strangeness of fellow travelers, unfortunately. I feel if you are the only person in the exit row you should probably expect someone to try to move into the seat at the other end and have no right to expect it to be kept empty unless you've paid for it. Why someone would deliberately move themselves to a middle seat between two other people I have no idea, however.