Over the course of its 12 seasons, The Big Bang Theory has a wellspring of memorable, hilarious moments that stand out: Sheldon (Jim Parsons) coming into the living room holding multiple bath item gift baskets for Penny (Kaley Cuoco) in "The Bath Item Gift Hypothesis," Howard's (Simon Helberg) little Wolowitz in the steely grasp of a robotic hand in "The Robotic Manipulation," or anytime Bob Newhart's Professor Proton appeared.
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