Tobias Sonne, a student at Carnegie Mellon University, developed a pair of suspenders that encourage the user to sit up straight. He attached a strip of conductive fabric to one side. When it's compacted, a buzzer activates. It's not bad. But, as Lauren McCarthy's Happiness Hat demonstrates, an electric shock would probably be more effective.
Link -via DVICE
I think they forgot that sitting up straight is bad for you... (http://en.wikipedia.org/wiki/Sitting#Posture)
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