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Stories Behind The Big Bang Theory Shirt:
Schrodinger's Cat T-Shirt T-Shirt - In The Big Bang Theory episode, "The Tangerine Factor" (May 19, 2008), Leonard's attempt to arrange a date with Penny results in both Penny and Leonard's seeking Sheldon's advice. Sheldon advises Penny that just like Schrodinger's cat being alive and dead at the same time? her date with Leonard currently has both good and bad probabilistic outcomes. The only way to find out is to open the box? in other words collapse the wave-function of an uncertain date into a specific outcome. Also, in the episode "The Russian Rocket Reaction" (Oct 13, 2011), Sheldon characterizes his relationship to Leonard as "Schrodinger's friendship", in the sense that Leonard is simultaneously his friend and mortal enemy (as he may or may not attend Wil Wheaton's party). When Sheldon tries to explain the paradox to Penny, she gives an approximate description: "[...] there's this cat in a box and until you open it, it's either dead or alive or both [...]". Penny references it during a brief conversation with her new boyfriend in "The Codpiece Topology" (September 29, 2009), and Leonard references it during lunch with the guys in "The Bus Pants Utilization" (January 6, 2011).