Slow boarders

What's the problem? Passenger boarding rates are twice what they were in the 1970s, thanks largely to these human speed bumps, who stow overhead bags and tuck into their seats like boarding a stage coach for Deadwood.

Why they're dumb: Air travel is plenty unreliable as it is without the living dead loitering in the aisle like it's a 7-Eleven parking lot. These are also the people most likely not to pull into the intersection while waiting to make a left turn.