Why 'The Big Bang Theory' Is Comedy Chemistry Gold

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It's Luau Day on the set of "The Big Bang Theory," with the crew adorned in Hawaiian flower-print shirts and the craft services table boasting a massive spread of island eats. Johnny Galecki, who plays Leonard, gets into the spirit as he ambles through a small patch of grass just outside the door of Stage 25 on Warner Bros.' Burbank lot, softly strumming a ukulele ("I keep it around the set," he says with a smile) as he waits for his next scene.

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