Best Viral Videos of Summer 2009

Viral videos come and go so quickly, it's easy to miss them. But to keep up with the latest in pop culture, you need to tune in to YouTube, not MTV. Here are our favorite online videos of the summer -- whether you've seen these specimens once, twice or a hundred times, they're all worth another watch. Are there others you'd recommend? Use the comments to tell us what we've missed (and please include a link!).

Motherlover
This Mother's Day Saturday Night Live Digital Short featuring guest host Justin Timberlake and SNL regular Andy Samberg is technically from late spring, but it's so good we had to include it. The guys reprise their "D*** in a Box" roles and vow to give each other's mothers (played by Susan Sarandon and Patricia Clarkson) the love they need.

He's Barack Obama
In JibJab's "He's Barack Obama," the President is a Blackberry-wielding cartoon superhero who's here to save the day -- fueling your car with nuts and corn and filling Iraq with fuzzy pink bunnies. He also fist-bumps the occasional world leader.

Roller Babies
Creepy computer-generated babies dance to Sugarhill Gang's "Rapper's Delight" as they roller skate around Central Park in Evian's new ad. Did we mention that they're creepy?

Web Site Story
West Side Story-style characters sing about the joys of Twitter and Facebook stalking and the woes of finding a date on eHarmony. "How could a modern technology hold onto a 50s philosophy?" the characters sing as they dance across the rooftop.

Train Vs. Tornado, Train Loses!
It's as simple as it sounds: What happens when a train passes near a tornado, as captured by a mounted security camera. Watching the first cars derail is fun, but the action that follows is terrifying.