Yesterday our plane broke and since I would miss my connection they kindly rebooked me on a flight this morning. It was a very long night and I missed the flight. 30 minutes later I tried to rebook with an agent (still can't figure out the new website). We spent an hour on the phone trying to figure out how to do it.
Turns out someone reprinted my boarding pass and used it to board the flight. As me. Since according to the system I was on the plane, it wouldn't let me rebook the flight. Sounds like an episode of Homeland.