This collection contains 3 hilarious holiday episodes ofThe Big Bang Theory, "The Bath Item Gift Hypothesis," "The Maternal Congruence" and "The Santa Simulation"!"The Bath Item Gift Hypothesis"(Original Airdate: 12/15/08)Penny gives Sheldon the most exciting, wonderful, amazing Christmas present ever. Sheldon gives Penny soap."The Maternal Congruence"(Original Airdate: 12/14/09)I saw Mommy kissed…who? Christmastime brings Leonard's mother and a number of surprises, including that smooch."The Santa Simulation"(Original Airdate: 12/13/12)Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons & Dragons, while Raj joins the girls for ladies' night out.