Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

Directed by: Chuck Lorre - Anthony Joseph Rich - Bill Prady - Steven Molaro

Writer credits: Chuck Lorre - Bill Prady

Cast: Johnny Galecki - Jim Parsons - Kaley Cuoco - Simon Helberg - Kunal Nayyar

AKA: The Big Bang Theory, The Celebration Reverberation, Теорiя великого вибуху, Agymenők, TBBT, Teoria wielkiego podrywu

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