With 28 medals, Michael Phelps is the most decorated Olympian of all time. Considering all but 5 are gold, it's hard to find a worthy opponent for the swimmer. But Phelps may have met his match when he went head-to-head with a Great White for a Shark Week special. Okay, so it wasn't an actual Great White. Instead, a simulated version created using data from the real thing faced off against Phelps in a 100-meter race, ensuring no animals or humans were harmed in the process.