'The Big Bang Theory's' Risky Choice

Sheldon (Jim Parsons) and Leonard's (Johnny Galecki) dysfunctional friendship is arguably the heart of CBS' "Big Bang Theory," but Galecki is the first to admit that the dynamic duo "could implode or split up at any second."

In a recent interview with Gold Derby, Galecki discussed the relationship between Leonard and Sheldon -- specifically why Leonard hasn't just slapped Sheldon for all his irritating behavior and constant putdowns. "You would be surprised -- or you might not be surprised -- how often I'm asked that question," Galecki laughed. "They really, truly need each other on some levels ... They have very different hearts, but they share the same brain in a lot of ways."



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