. 18. “The Bad Fish Paradigm” May 24, 2008 Leonard & Penny return from their date May 31, 2008 Penny confesses to Sheldon that she did not graduate , he freaks out about keeping a secret and moves out June 1, 2008 Penny dumps Leonard September, 2008 Penny’s check engine light comes on [The Euclid Alternative] 19. “The Codpiece Topology” September 21, 2008 - the boys attend the renaissance fair September 25, 2008 – Leonard makes a date with Leslie Winkle Friday, September 26, 2008 – Leonard’s date with Leslie September 27, 2008 – Leonard & Leslie’s second date & break up May ___, 2009 – at MNP