8. Typing/Texting Twit. You sit down, and boom! The elbows start flying, and you start hurting. Whether the moron next to you is typing or texting, it comes down to the same thing: bruises. The fun continues when you try to explain the discolorations to the spouse. Bonus Points: Twit finally puts away the phone and laptop -- only to pull out the PlayStation, to begin a zestful round of "NHL Hockey."
9. Snuggle Bunny. Snuggle's sin is fatigue. Fatigue and the inability to distinguish between your shoulder and a pillow. Snuggle will snore away the entire flight, in comfort -- on you. Bonus Points: Snuggle Bunny has a drooling problem.
10. Lavatory Lizard. Lizard is kin to Jack in the Box; he too hops up again and again, to head to the restroom. And without fail, Lizard urges you not to get up -- and then steps on your feet. Bonus Points: Whenever the flight attendant comes by, Lizard is the first to say, "Another water, please!"
11. Yellular. For some reason, this middle seater believes his cell phone is actually a megaphone; he may be sitting in row 29, but believe me, the pilot can hear him loud and clear. Yellular gets on the phone the minute he sits down and doesn't get off till wheels up -- regaling you, and everyone else with conversations like, "How is the cat doing? Still got them hairballs?" Bonus Points: You're stuck on the tarmac for three hours while Yellular is yakking away about his latest romantic adventures -- in excruciating detail.
So, what's your favorite "middle seat sin"? Let's hear your stories.
This work is the opinion of the columnist and in no way reflects the opinion of ABC News.
Rick Seaney is one of the country's leading experts on airfare, giving interviews and analysis to news organizations, including ABC News, The New York Times, The Wall Street Journal, Reuters, The Associated Press and Bloomberg. His Web site FareCompare.com offers consumers free, new-generation software, combined with expert insider tips to find the best airline ticket deal.