McKayla Maroney takes a fall. (Photo : Reuters)

McKayla Maroney isn't just good, she's great. The 16-year-old California girl is widely revered as the best female gymnast in the world on the vault. Maroney's coach, Martha Karolyi concurs with popular belief telling the The Associated Press that her star gymnast is simply "the best."

Maroney may have the records to prove her super gymnast abilities but on Sunday the Olympic star did not do her best. During the women's vault final at the London Olympics, the reigning world champion failed her landing on her second attempt on the Amanar vault, falling on her bottom.

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Unfortunately, the Olympic medalist had to take a silver, making Romanian gymnast Sandra Raluca the gold winner. "I didn't deserve to to win gold if I landed on my butt," Maroney told reporters after the competition, via USA Today. "I'm not disappointed about the silver, I'm disappointed about my performance."

Maroney isn't the first champion to take a fall. Believe it or not but famous professionals are human and they do make mistakes. "It happens, it's gymnastics and you can't be perfect and sometimes things don't go as you planned," Maroney told Yahoo! Sports, "I can't blame it on anything except I screwed up."

Other greats in their own lane have "screwed up" at their skill too. World-renown performers have forgotten lyrics during performances, NBA ballers have missed a shot, and politicians have stumbled on their words. Maroney's fall just shows that even the best don't do their best all the time.

Check out 5 of the most memorable falls from the world's best:

Beyoncé Knowles is a world-class singer and dancer but even she can miss a step...literally. The bootylicious entertainment took a tumble down a flight of stairs on stage during a 2007 concert. However, the soulful diva got up and still kept the show going -a true champ.

Naomi Campbell is one of the world's top models. The 42-year-old actress still gets jobs while most models' career ends at 25. But even at the peak of her career in 1993, the supermodel took a hard fall in a Vivienne Westwood show while wearing sky-high platform heels. The professional Campbell brushed off the embarrassment with a laugh and continued the catwalk with her world-famous strut.

Kelsey Grammer is one of the most famous actors of all time. Not only is the award-winning actor, writer, and producer known for his superb work, he is also considered a great public speaker. During a ceremony in which Grammer was speaking, the always-poised actor took a hard fall off the stage. His tumble lives on forever thanks to the viral video.

Shania Twain has been in the music industry for years, so award shows are nothing new to her. The singer has flawlessly walked to the center stage podium plenty of times in her career. However, in 2011 as she walked to the stage at the CMT awards, Twain took a painful slip before millions of viewers and audience members.

Lady Gaga is the queen of avant garde and outrageous fashions. After sporting meat dresses, a human-sized egg, and feet high platforms it was only a matter of time before Gaga's daring style choices took a dangerous turn. Gaga is no stranger to falling during performances; she easily disguises them as wild dancing while she rocks out with the crowd. However, whenever the quirky starlet walks her catwalk, that is the outside world, she effortlessly displays her crazy fashion picks with ease and confidence. In 2010, one of Gaga's fashion choices was too daring, even for her. As she walked through London's Hearthrow airport wearing super high heel-less platform boots, the mother monster lost her balance causing her to hit the pavement...hard.