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Bieber's Big Break and the Harlem Shake: The Videos That Made YouTube

Happy 10th Birthday!
Singer Psy performs 'Gangnam Style' in Frankfurt, Germany.

Singer Psy performs 'Gangnam Style' in Frankfurt, Germany.

Photographer: Kevin Mazur/WireImage via Getty Images

On April 23, 2005, YouTube debuted its first video, an inauspicious clip of a guy at the San Diego Zoo gawking at a bunch of elephants. In the decade since, seemingly every other animal on the planet from cats to dogs to chipmunks to otters to pandas has taken a turn as a top YouTube star. But in the end, all due respect to the honey badgers, it's the Homo sapiens of earth who have proven to be YouTube's wildest performers. Today, as YouTube turns a decade old, here are 10 of contemporary civilization's best videos without which YouTube just wouldn't feel like YouTube.