This is sent to me with the absolute assurance that it's a genuine picture taken by a flight attendant at American Airlines. The F/A took it to show her manager what was happening on the aircraft (757???) and why she was unhappy about it. Seems the guy paid for only one seat and the gate staff let him board.

You can see the F/A's point of view - how the heck is s(he) supposed to deal with it. Sympathise with the guy or not, he's a major safety hazard in an evacuation, a gross inconvenience for the cabin crew, and I would suggest a totally unacceptable travelling companion for the guy next to him.