Top 10 Viral Videos of All Time

What makes videos go viral--from unknown to 100,000 views overnight? This sampling of some of the greatest-ever virals should help you figure it out.

1. Evolution of Dance

Over 138 million viewers--over 2 percent of the world's entire population--have seen comedian Judson Laipply's act out the history of 20th-century dance. A funny man who's also clearly an athlete and a music lover.

2. LEAVE BRITNEY ALONE!

A mere 30 million humans have watched Chris Crocker's tearful appeal to, well, everyone to just leave Britney Spears alone. Relive fateful lines such as "She's a human! Britney's making you all this money and all you do is write a bunch of crap about her!"

3. Diet Coke + Mentos

So far over 11 million have watched guys in lab coats turn a few liters of Diet Coke and some breath mints into explosive geysers. As a side note, the same combo can also be used in model rocketry.

4. The Landlord

Even people who dislike Will Ferrell will be hooked by this video of a harmless-looking little two-year-old girl playing Ferrell's landlord--then cursing him out for not paying the rent and staggering off holding a beer.

5. Laughing Baby

Laugh along with a Swedish baby who continually cracks up after hearing funny noises. Over 110 million views to date.

6. Star Wars Kid

You try to look away from this 1:49 video of a pudgy kid repeatedly trying to duplicate Darth Maul's lightsaber moves--and yet like the proverbial train wreck, you watch to the embarrassing end. Over 16 million others couldn't resist, either.

7. Numa Numa

Transylvanian pop culture comes to your PC as New Jersey's Gary Brolsma lip-syncs the Romanian disco hit "Dragostea Din Tei" to his webcam.

8. Lonely Girl: First Blog/Dorkiness Prevails

This video started "lonelygirl15" on her way to alluring thousands of teenage boys with her loneliness, shyness and all-American good looks. Turned out it was all a fraud, but it captured the attention of millions and eventually, the New York Times.

9. Obama Girl/Crush on Obama

This video love letter to then-presidential candidate Barack Obama spawned 17 million views, a host of parodies and even a competing Giuliani Girl.

10. Susan Boyle

Boyle sprang from a modest Scottish village to worldwide fame thanks to this segment from Britain's Got Talent, which brought her soaring singing voice to an audience of millions.