The ever-present internet troll. We've all seen them online, or at least tried to ignore their irritating comments and rants that appear in social threads. But have you ever wondered who's sitting behind the keyboard trying to provoke you into losing your cool while discussing serious or important topics? This infographic (via Best Psychology Schools) examines the thought process and potential psychological impairment of internet trolls. And most importantly, how you can get into their head to make them back down.