is the sixth episode of the third season of the CBS sitcom The Big Bang Theory . It originally aired on November 2, 2009. Plot Summary
: Sheldon explains that his football knowledge comes from his father, though this episode predates the specific coaching details established later in the prequel series Young Sheldon . Episode 6: The Cornhusker Vortex
The episode follows two primary storylines: Leonard's attempt to fit in with Penny's social circle and a rift in Howard and Raj's friendship. is the sixth episode of the third season