You have to love people who can pull off a good prank at work.

The cast and crew of 'The Big Bang Theory' shocked their directors and live audience with an awesome flash mob.

It happened during filming, except when the director yells, 'Action!' Carly Rae Jepsen's 'Call Me Maybe' started playing...and then the fun started.

Check it out:

My favorite is how it ends with Jim Parsons' character Sheldon saying his signature, 'Bazinga!'

Have you ever been part of a flash mob? Tell us about it below!