Boris Onishchenko, a Ukrainian pentathlete, was the three-time world champion in the event, but that still didn't stop him from cheating at the '76 Olympics. By tampering with the sensors on his equipment, he made it seem like he was making contact with his opponents when he really wasn't at all. His scheme was uncovered almost immediately, resulting in his ejection from the Olympics and newspapers dubbing him "Boris the Cheat."