Advertisements This is among the dumber threads I've seen on this forum, and those of you who have been around as long as I have or longer, you know what an achievement that is. That said: Penny knows that Sheldon does not drive. He wasn't drunk enough to hurt himself or others, and she knew that he would ride the bus home, meaning he'd get home relatively safely. She was a bartender, she served him a drink, he accepted it and drank it. End of subject. And BTW, it's "Leonard," and the show is as much about him as it is about any of the other main characters.