And here's the video:
http://www.nbcolympics.com/athletes/5058592/detail.html?qs=;t=19;tab=Video(can only be viewed when your in the US, but i'm sure you can get it from local sources in every country, just google "Jacobellis, bordercross, olympic, video")
check in the bottom "Jacobellis crashes, gives up gold"
And for those unable to view it, here's the story:
Jacobillis, the odds-on fav to win the Boardercross title at the Olympic games, leads the final run by about 10 seconds (which is like a 30pt lead in the NBA). On the next-to-last jump, about 80 yards from the finish line she tries a showboat move during the jump, fails and falls down, and while recovering and trying to reach the finish line, her opponent, stunned herself, drives past her and wins the gold medal by a few seconds.
You have to see it to believe it ...