Leonard is doing experiments at night, so Sheldon has to find someone to drive him to work, and to Radio Shack, the comic book store, etc. At first, he has difficulty comprehending that Leonard isn't going to drive him, but when he figures it out, he asks Penny for the favor. He drives her crazy in the car, where she has a "check engine light" on. It turns out it's been on for about a month. Then he wants to play games with her. The game he picks is one based on the elements. Naturally, Penny refuses to play, so Sheldon plays both sides. When Sheldon gets out to check out the car's engine, Penny drives off without him. Later, Howard creates a simulator so Sheldon can practice driving. But he ends up on a simulated killing spree. Finally, Sheldon decides to sleep in the office while Leonard is doing his night experiments. What Leonard doesn't tell him, however, is that his finished his experiment a week ago.
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