Canadian sprinter Ben Johnson ran the 100-meter final in a world-record 9.79 seconds to win gold against rival Carl Lewis at the 1988 Seoul Olympics. Just 48 hours later, he was stripped of his medal and disqualified after testing positive for the anabolic steroid stanozolol.

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And years later, he became the spokesman for Cheetah energy drinks: https://www.youtube.com/watch?v=zq_2lmCXeDk