: The ball pit scene was so funny that an outtake exists of Jim Parsons unable to stop laughing during the "Bazinga" takes. The Einstein Approximation | The Big Bang Theory Wiki

: While Sheldon loses his mind, Leonard, Penny, Howard, and Bernadette go on a double date to a disco roller rink—an idea originally from Raj, who ends up feeling left out. Fast Facts Original Air Date : February 1, 2010. Watch www xrysoi se The Big Bang Theory -S03E14-

: The employment agency worker who sarcastically deals with Sheldon is played by Yeardley Smith , the long-time voice of Lisa Simpson on The Simpsons . : The ball pit scene was so funny

In this fan-favorite episode, Sheldon experiences a severe case of "physicist's block" while trying to figure out why electrons behave as if they have no mass when traveling through graphene. : The employment agency worker who sarcastically deals

: Deprived of sleep for three days, Sheldon breaks into a children's play center and hides in a ball pit. This leads to the iconic scene where he repeatedly pops up, yelling "Bazinga!" as Leonard tries to catch him.