We all dream of watching a supermodel walk down the aisle and sit in the seat next to you. Unfortunately, that dream almost never happens. Being on a plane these days can be a pretty gnarly experience, especially if you get stuck next to the guy who is stringing together seat-belts to fit around his 74-inch waist. Today, we count down the 10 worst characters to get sit next to on a plane. From the nervous flyer to the gum smacker, we touch all bases.