The Big Bang Theory Episodes :- The Bad Fish Paradigm

In Season 2 Episode 1 Penny and Leonard return from a date while an envious duo of Howard and Rajesh spy on them. Meanwhile, Penny shares her secret of not completing community college with Sheldon, requesting him to not mention this to Leonard. However, as Sheldon cannot lie to Leonard he prefers to move out and goes first to Rajesh’s and then Howard’s place. Unable to settle down in either’s place, he is bought back to the apartment by Howard, where he reveals Penny’s secret to Leonard after a dose of Valium. On learning the truth Leonard tries to help Penny by giving her some pamphlets about some local community colleges, which annoys Penny and she shuts the door on Leonard’s face. As the episode ends, Leonard finds out about Wolowitz and Koothrapalli, being aware of the whole incident through their eavesdropping with the help of a webcam.