I think the worst absolute nightmare for traveling in the middle seats is if you had to seat on either side of this guy. You can see a picture of him in this channel. Be careful. This man has no cuthe or respect to the way he talks. But this would be the absolute nightmare travelling next to. I would have to elbow him good.

http://www.youtube.com/watch?v=iLdkz6HYBGg...feature=related