Extensive commentary is available at this Telegraph article, which reports that Southwest Airlines is investigating the incident.
Seriously, I'm not making fun of this guy, I'm not. What is absurd, is that he is trying to get away with paying for just one seat. Seriously, he needs two seats, half of him is hanging out into the aisle. Also, what are you thinking if you are the guy next to him? "I hope I don't have to use the restroom..."