Big bang theory four years

What a difference four years have made. When the cast of "The Big Bang Theory" first appeared at PaleyFest in 2009

• 2013-03-14T18:03:19+00:00
• Duration: 10:21

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cel, celebratin, celebracion, cel, stars, show, performance, tv, television, entertainment, Big bang theory four years, tv, television, comedy, humor