Didn't pay attention to the event but there are some huge achievements that i might not be able to see again.
Phelps achieved his 22 Olympic medal today. That means he now has the same number of medals that Portugal has, during the entire 100 years of participation in Olympic events. Furthermore, we (PT) only achieved 4 gold and he has 18 (double than the next highest record holder.....). Unfortunately he said this are his last games, he could increase the record even more in the next Olympics. Anyway he already achieve something near to impossible to break, is rich and wants to spend the rest of his young years having fun.
(However it is a bit stupid to compare athletes by the number of medals since it really depends on the specific even. For instance in judo each athlete can achieve only one medal per game.)
Two other interesting incidents for me are:
The gold medal by Ye Shiwen (16 years), beating the world record by almost one second and smashing her personal best by 5. She also did the last 50 meters faster than Lochte. This raised a lot of questions about doping, with a public accusation by someone from the USA.
After that we had a similar situation with an American girl (Katie Ledecky), winning gold in her first Olympic games with 15 and taking 11 seconds to her personal record in the last month.
... both cases are incredible suspicions