New Zealand's Kurt Pickard (black) and Ecuador's Emilio Andres Falla Buchley (yellow hat) collide and crash as Australian Olympian Khalen Young jumps over them in the BMX quarterfinals.
2 of 22Simon Bruty/SI
Germany's Matthias Steiner fails to lift the weight on his second attempts and falls, dropping the bar on his head.
3 of 22Mike Theiler /LANDOV
American gymnast McKayla Maroney was favored to take gold in individual vault. On her second of two vaults, Maroney shocked the world when she failed to stick the landing--and ended in a sitting position on the mat.
4 of 22John Biever/SI
Gabby Douglas, individual all-around Olympic champion, fell off the beam during the individual beam competition, just days after winning all-around gold.
5 of 22Robert Beck/SI, Heinz Kluetmeier/SI
Liu Xiang, China's premier hurdler, clipped the first hurdle of the race and fell, failing to even finish the race.
6 of 22John W. McDonough/SI
Nicolas Batum of France went out of his way to punch Spain's Juan Carlos Navarro in the groin area during a quarterfinals game.
7 of 22Peter Read Miller/SI
Ruslan Nurudinov of Uzbekistan falls after failing to hoist the weight during the men's 105kg competition.
8 of 22David E. Klutho/SI
Harinelina Rakotondramanana of Madagascar falls during her lift in the women's 48kg event.
9 of 22Bill Frakes/SI
Shamar Sands (far right) trips and falls during the 110-meter hurdles preliminary, ending his gold medal pursuit.
10 of 22STEFANO RELLANDINI/AFP/GettyImages
Four women cyclists try to detangle and recover after a collision that resulted in a pileup during the road race.
11 of 22Adam Pretty/Getty Images
Costa Rica's Leonardo Chacon has to be helped off the course after he fell off his bike at the end of the men's BMX competition.
12 of 22DIEGO AZUBEL/EPA/Landov
A runner during the 3000m steeplechase takes a tumble into the inside lane.
13 of 22Ivan Alvarado/Reuters
The Dominican Republic's Altagracia Rivera Brens collides with the barrier during a Group A volleyball match.
14 of 22ZUMAPRESS.com
Harald Ambros of Australia falls off before a jump in the Equestrian event.
15 of 22ZUMAPRESS.com
Aurelie Malaussena of France slips on the balance beam during the All-Around final.
16 of 22David Eulitt
Benjamin Provisor of the U.S. gets his face planted right into the mat as he wrestles Cuba's Alexei Bel in a Greco-Roman 74kg class qualification match.
17 of 22Chris O'Meara/AP
Poland's Michal Winiarski crashes into the back wall after saving a shot during a match against Bulgaria.
18 of 22Julio Cortez/AP
Rhys Howden of Sebia blocks a shot on the goal ... with his face.
19 of 22ZUMAPRESS.com
Philipp Boy of Germany misses his grip on the uneven bars.
20 of 22GEOFF CADDICK
Brazil's Wallace de Souza crashes right over a photographers section in the men's volleyball quarterfinal against Argentina.
21 of 22Chen Xiaowei
Okori Reina-Flor of France stops running after realizing she false-started during the 100-meter hurdles semifinal.
22 of 22Al Tielemans/SI
John Orozco hit the pommel horse during the men's team finals in gymnastics, posting a lowly 12.733.
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