The Big Bang Theory‘s Kaley Cuoco unleashed a secret she’s been sitting on for a few weeks when she tweeted a link to a video of a surprise flash mob performed by the show’s cast and crew to the delight of the studio audience. In the footage, shot during an October 23 taping, several crew members break into a meticulously choreographed flash-mob dance routine set to Carly Rae Jepsen’s “Call Me Maybe” as the cast, feigning puzzlement, joins into the routine, resulting in riotous audience applause when it finished.