We've all seen it. The able-bodied college students slouching in their seats, scrolling through their iPods, oblivious to their surroundings. The able-bodied yuppie, sitting up straight, reading a book that's been turned into a movie, being distracted by a call from the spouse. What do these people have in common? They sit while others who need seats stand.

Boston Seventh Strangest City in U.S.