i'm usually really good at pointing out a jerk within a few seconds of meeting them. i don't know what it is, but if i see someone, even if i don't see them doing anything that would make them seem like a jerk, and i get the impression that they're an a**hole, it almost always turns out to be right. now you could say that's biased, i think they're a jerk therefore i notice everything they do that would make them seem like one, but in all honesty, i try to dismiss my first impressions but they almost always turn out to be right.