5. Chris "C.T." Tamburello, The Real World: Paris (2003)
C.T. is quite possibly the least stable Real World cast member ever. Dude was the ultimate asshole: rude, selfish, anti-social, confrontational, and not afraid to fight. C.T. earned his top five douchebag status by constantly picking on soft, 80-pound Adam. Tensions boiled over between them when C.T. rocked Adam with a Tyson-like right hand in The Real World/Road Rules Challenge: Duel 2 season premiere. It’s a fight that instantly became an all-time classic reality TV moment.