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Justin Timberlake, Pope Francis, ‘The Bachelor’ and More Viral Videos

From George W. Bush’s first flash mob to Olivia Wilde’s Justin Bieber feud and the new pontiff greeting the world, watch our countdown of this week’s buzziest videos.

03.16.13 8:45 AM ET

10. Flash Mob Welcomes H.W.

When President George H.W. Bush visited the school that bears his name at Texas A&M University on March 1, he was greeted by what his perplexed look suggests was his first flash mob.

9. Journo Geeks Tell Jokes

Did you hear the one about the social media expert? No? Well, some of your favorite reporters, from David Carr to Ben Smith, got together to tell their best (worst?) jokes for you.

8. Olivia Wilde Vs. Justin Bieber

The actress learned the hard way that she might be too old to be a lesbian. Wilde recently stopped by The Tonight Show to rehash her Twitter feud with Bieber (and his almost 36 million followers).

7. Shaq Is Secretly a Huge Nerd

Who knew the former basketball star was such a techie? In an interview with Bloomberg at SXSW, Shaq admitted that he tried to score the very first iPhone, but Steve Jobs “wouldn't budge.”

6. Senator Portman Backs Gay Marriage

One of Congress’s strong same-sex marriage opponents has had a “change of heart.” Citing his son’s coming out, Sen. Rob Portman (R-OH) told CNN's Dana Bash that “I now believe people ought to have the right to get married.”

5. JT Brings Sexy Back…Barbershop Quartet-Style

Now that's a remix! Fresh off the SNL stage, Justin Timberlake joined Jimmy Fallon and the Ragtime Gals to perform a smooth a cappella rendition of “SexyBack.”

4. Jeff Gordon Goes Incognito

This poor car salesman. What started out as a typical test drive quickly turned into a wild ride, as Jeff Gordon went undercover to promote Pepsi MAX in this epic prank.

3. ‘The Bachelor’ Proposes

And she says yes! After saying no to 25 other women, Sean Lowe finally found the one, Catherine Giudici. “You never cease to amaze me,” said Lowe before popping the question.

2.  New Pope Francis Greets the World

Watch the new leader of the Catholic Church,  Argentinian Cardinal Jorge Mario Bergoglio, step onto the balcony of St. Peter’s Basilica and make his first remarks to the cheering masses in Vatican City.

1. SNL’s Five-Time Superstars

Justin Timberlake got inducted into a special club on Saturday Night Live, joining Steve Martin, Alec Baldwin, and Candice Bergen as a five-time host. Literally: they all joined him on stage.