"Call Me Maybe" flash mob! Thanks Kaley Cuoco!

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The cast of The Big Bang Theory broke character big-time during a live taping for Thursday night’s (15 November) episode — with a flash mob!

Just after ‘action’ was called on a scene for “The 43 Peculiarity,” the actors — including Jim Parsons (Sheldon Cooper), Johnny Galecki (Leonard Hofstadter) and Kaley Cuoco (Penny) — seemed startled as Carly Rae Jepsen’s “Call Me Maybe,” sounded through the stage.

Moments later, the entire crew assembled in front them and launched into a synchronized dance.

And whose idea was it? Of course Cuoco’s. Seems she had been waiting for this for a long time. Check out her tweets… 

Ok it’s here! The moment I’ve been waiting for!I finally get to share the surprise!!the BIG BANG THEORYFLASH MOB! on.fb.me/XJ0Stc

— Kaley Cuoco (@KaleyCuoco) November 15, 2012

Who enjoyed the flash mob?!FYI that was only a tiny piece of it!!Trying to get you the rest of it!!!! Aaaghhhh!!! — Kaley Cuoco (@KaleyCuoco) November 15, 2012