Actress Kaley Cuoco, who plays Penny on the Emmy Award-winning series, and her colleagues surprised creator Chuck Lorre and the live studio audience with a routine to Carly Rae Jepson's hit Call Me Maybe.
Immediately after the comedy dance, which was choreographed by Cuoco's sister Briana, the actors returned to their positions and waited for Jim Parsons' character Sheldon to deliver his catchphrase ""Bazinga!"".
Cuoco took to her Facebook.com page to post a video of the routine, alongside the message, ""Hello to our awesome Big Bang fans! Finally the moment has come... All my dreams have come true...
""Yes, my dream to have a live, full out, dance routine for the world to see, has finally happened... I present to you... The Big Bang Theory Flash mob!(This literally was the best night of my entire life) Enjoy!! Ps. A special thanks to the cast and bad-ass crew, for going all in, and making it a night to remember! Pss (sic). My sister Bri choreographed the entire routine!""