What do the folks at Twitter do when they aren't adding new features or likely having semi-erotic daydreams about an IPO? Justin Bieber flashmobs in the company cafeteria. Swoon.

So how'd they do? Definitely well below the White Girls Rapping About Windows Phone threshold of cultural horror—that one guy can actually dance pretty well!—but it looks pretty much exactly like what "Twitter employee Justin Bieber flashmob" evokes in your head. Have fun at your boring by comparison office lunch tomorrow, suckers. [via BuzzFeed]