4. Justin Gatlin
Olympic track and field stars are notorious for doping. One of the most disappointing incidents came in 2006 when Gatlin tested positive for tetrahydrogestrinone. Banned substance THG improves your endurance by producing short-term energy when oxygen is short. Obviously, it’s not exactly kosher for a 100m Olympic gold medallist. When he failed a drug test, the sport’s governing body banned Gatlin for four years from the track and field competitions.

However, Gatlin’s coach came out with one of the most ridiculous excuses in the history of humanity. In short, he claimed that a massage therapist rubbed it into the athlete’s body without him knowing. This is about as likely as the Charlotte Hornets winning the NBA championship. Needless to say, he didn’t convince many if anyone with this defense and Gatlin served out his ban. It was a downward moment.