Advertising has been obsessed lately with scaring the crap out of people. So here, for your Friday enjoyment, is a more benign prank. Target, which is the exclusive retail partner for the release of Justin Timberlake's new album, got 20 of the pop star's biggest fans together for a commercial shoot. They thought they would just be singing a Timberlake song for the ad. They didn't realize the great and powerful JT himself would actually be there. Check out the spot below, and a behind-the-scenes video after the jump. All the reactions are genuine. Decent work by Deutsch in Los Angeles—though to be honest, the bar for this kind of thing was set by David Beckham and Adidas last summer. If you don't leave someone sobbing tears of joy, maybe you haven't gone far enough.