Seat kidnapping
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I find it hard to believe this is a thing, but there you go.
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That happened to me one time on a domestic India flight. I boarded and this old lady was sitting in my seat. On shorter flights, I usually choose window. Anyway, she was clearly in the wrong seat. I called the attendant who spoke to her and she refused to move. It was kind of a short flight, so I just took her seat for the flight.