Apparently "flash mob" dances are still a 'thing', because the cast and crew of "The Big Bang Theory" recently did one to Carly Rae Jepsen's "Call Me Maybe".
Remember 'flash mobs'? Yeah...people still do them. A full orchestra dressed in plain clothes did one in Germany recently, and performed the 'Star Wars' theme in the middle of a shopping district.
We've got another over-the-top marriage proposal to tell you about. A guy surprised his girlfriend with a flash-mob AND a marching band in the middle of Bryant Park in New York City.