I enjoy watching sports that I haven't seen before. I watched a swimming competition with the sound turned down on the telly, so I guessed the rules.
30 swimmers meet at the starting line. They decide on who is "it", probably by "dibbing" ("One potato, two potato, three potato more..." etc). Then the all dive in the water, swim for two hours and chase the guy who is "it" and try to pull his swimming costume off or kick him in the face.
The guy who is "it" (who seemed to be British) tries to shake them off by swimming in the wrong direction. Anyway, the British guy got kicked etc, but didn't lose his costume so he got silver medal... result.