Penny and Leonard's mom, Beverly (Christine Baranski) go for some shots of tequila at the Cheesecake Factory.
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Penny comes to Sheldon for help to better understand Leonard's work and here he is training her.
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We love any scene involving Sheldon and Penny together and here he is taking her to the hospital when she's injured.
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With Leonard gone, Sheldon helps an injured Penny. She looks a little loopy here.
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Leonard and Penny act as parents as they go to pick up Sheldon from the comic book store.
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Sheldon comes to visit Penny at work at the Cheesecake Factory to try and convince her to apologize to Leonard to stop the fighting.
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Penny joins the nerds in a friendly game of cards. Here's a cute picture of her smiling as Leonard look at her.
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We sure see a lot of Penny and Leonard in bed. Not that were complaining, this is where we want to see this couple!
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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon