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.

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A new feature, targeted at helping those poor souls who may not realize how their behavior affects others on the T. Got a mannerly tip? Email us at tips at bostonist dot com.