This is the student that suddenly decided to stop being friends with you or someone else, usually for no reason whatsoever. At one point you clicked and were two peas in a pod. Now...you're not sure what they are, but they're definitely not friendly towards you or other people. They think school is all about how popular you are or how great you can finish an argument with the teacher or bus driver. They also like to bother and make fun of people, occasionally name-call them, and make up excuses for any bad behavior they have, including shifting blame to others. Who knows? Maybe they're upset or something happened that made them become this way. But usually not. In any case, someone needs to help  this poor unfortunate soul....: