High school is a cruel place. One minute, someone is on top of the world: They’re the most popular person in school, beloved by all and with a packed social life. One fatal mistake later, and suddenly no one wants to know them. At least, that’s what happened to these popular kids with swift and brutal downfalls. 1. Rebel Without a CauseThis one guy was popular because he was a rebel who talked back to teachers, and even insulted them openly whenever he felt like it. We all thought he was so cool and anti-establishment…until the one day he took it too far. He made the teacher everyone loved c…