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Howard struggles with whether or not he should open a letter from his father, and Leonard (Johnny Galecki) and Penny (Kaley Cuoco) throw a “grown-up” cocktail party at the apartment, on THE BIG BANG THEORY, Thursday, March 14th on the CBS Television Network. Also pictured left to right: Mayim Bialik and Jim Parsons Photo: Michael Yarish/Warner Bros. ©2013 Warner Bros. Television. All Rights Reserved