Leonard became interested in Penny almost immediately after seeing her for the first time. His infatuation with Penny becomes the major force that drives the series during the first few seasons. By the end of the first season, Leonard finally manages to ask Penny out, and they have their first date. Subsequently, they don't go on any future dates after Penny asks Sheldon if Leonard ever dates "regular" women. She then tells Sheldon that she lied to Leonard about graduating from community college. When she asks Sheldon to keep it a secret, he cannot do it, so he moves out, first to Raj's, then to Howard's after Raj kicks him out. Howard gives him warm milk with a handful of his mother's Valium mixed in, so Sheldon is high and loopy when Howard takes him home to Leonard. In his high state, Leonard tricks him into telling him Penny's secret. The next day, Leonard gives Penny brochures for local colleges. Penny gets offended, thinking Leonard is calling her stupid, so they stop seeing each other.