What Happens When You Flip This Giant Light Switch?

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You might know Improv Everywhere from their non-seasonal antics, whether it’s combining break dancing with ballet or stuffing a marching band into a port-a-potty. This highly organized troupe of professionals and inexperienced volunteers takes the notion of a flash mob to new levels.

In fact, this latest endeavor from these talented pranksters actually gives a whole new meaning to the term "flash mob,” with an on-demand light display that stuns viewers and freezes participants in place. It’s well worth a watch if you need a little extra Christmas cheer in your day, or if you just like a good surprise.