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Here are some of the best scenes from a classic episode of the hit TV series "The Big Bang Theory." The boys make up an elaborate lie so that they won't have to hear Penny sing in a show. At night, Sheldon worries that she will see though the fib they have told her, and wakes up Leonard repeatedly to go over the fine details of the story they've made up. To make things worse, he then gives him a thrashing at three dimensional chess!