That's How You Do a Flash Mob

flash mobs never fail to amaze me --Renzie Baluyut.

You gotta give credit to the guys who managed to pull off this stunt.

Here's a little background of what had gone down: Oprah kicked off her 24th season with the Black Eyed Peas' live performance of "I Gotta Feeling" on this stage they set up on Michigan Avenue in Chicago, IL.

But as you can see on this video, it had a special twist:

A well-executed flash mob is always such a joy to watch. Credit for this stunt goes to Michael Gracey- whose past flash mob-organizing credits include putting one together at a Liverpool train station that was used for a phone commercial.

This particular event had about 21,000 fans- with a number of local casting agencies tasked to enlist dancers to help make it happen.

Cheers, everyone!