11 Moments from "The Comic Book Store Regeneration"

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Penny folds laundry while talking to Sheldon

Penny (Kaley Cuoco-Sweeting, left) teaches Sheldon (Jim Parsons, right) how to "let it go," but can't follow her own advice after she learns something infuriating about Amy, on THE BIG BANG THEORY, Thursday, Feb. 19 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved