Through the distorted lens of a thwarted intent to get appreciation from people, the lack of positive feedback can cause a perfectly normal person to have their pin pulled! Then, after a brief period of calm (one one thousand, two one thousand, three one thousand) BOOM!!!!! Behavior becomes increasingly unaimed, and inerringly draws lots of negative attention. Ranting and raving are difficult to ignore. But since this desperate behavior produces negative attention and disgust, the Grenade is ever more likely to blow up at the next provocation.
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Ten Types 
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