Above all, there was Dara Torres becoming the oldest swimming medalist in history, at the age of 41, by taking silver with the U.S. 4x100-meter freestyle relay team.
Twenty of the 31 other women in the relay Sunday were not even born when Torres first took the Olympic plunge at the age of 17 in 1984.
"It's just bizarre, I think I might be older than her parents," Torres said of a 16-year-old Australian swimmer, Cate Campbell.
But there would be no gold medal to go with the four that Torres had already won in her historically lengthy career. The Netherlands, which set the world record in this event in March at the European championships, ended up winning the gold comfortably in a time of 3 minutes, 33.76 seconds with their team of Inge Dekker, Ranomi Kromowidjojo, Femke Heemskerk and Marleen Veldhuis.
But Torres, who will also swim the individual 50-meter freestyle here, had no problem keeping up with the rest of the younger set. Her much-anticipated anchor leg maintained the United States in second place ahead of Australia, which took the bronze, and ahead of the Chinese, whose nation has been giving hints of a swimming resurgence here after eight surprisingly barren years (they also got an unexpected silver medal in the men's 400 meter from Zhang Lin).
Torres's anchor time of 52.44 seconds was better than any other woman swimming that leg except for the 100-meter world record holder, Libby Trickett of Australia.
"I think there are a lot of middle-aged women and men who I know and who have contacted me or e-mailed me or stopped me in the street and told me I was an inspiration to them," Torres said. "As I've said from the beginning of this, age is just a number."
Torres was already the oldest Olympic female swimming medalist in history, after coming out of retirement the first time to take gold in the medley relay in Sydney in 2000. But after this latest, more improbable comeback, she is now the oldest swimming medalist of either gender, breaking the century-old standard of Britain's William Robinson, who was 38 when he won the silver in the 200-meter breaststroke in the 1908 Games.
After deciding to return to elite competition last year, Torres has sculpted her body into a startlingly well-defined instrument capable of swimming faster now than in her younger years, raising some doubts along the way about her methods.
Torres, all too aware of such concerns in an era where doping has tainted too many an improbable sports story, has submitted to supplementary drug testing through the U.S. Anti-Doping Agency in an attempt to prove beyond a reasonable doubt that she is respecting the rules as she disrespects the biological clock.
She is now the first American swimmer to compete in five Olympics and has won 10 Olympic medals, the most on this powerhouse American team, although Phelps already has nine (and counting).