05/14/2013 09:09 pm ET Updated Jul 14, 2013

Why 'The Big Bang Theory' Is Comedy Chemistry Gold


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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