Leonard and Penny Argue

As usual, Leonard and Penny get into an argument. This time? About psychics.
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Decorating The Tree

Sheldon helps decorate the tree and wants to add the bust of Sir Isaac Newton, which he argues is more Christmasy than Jesus.
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Penny and Beverly Drink

Penny and Leonard's mom, Beverly (Christine Baranski) go for some shots of tequila at the Cheesecake Factory.
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Sheldon Teaches Penny

Penny comes to Sheldon for help to better understand Leonard's work and here he is training her.
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Sheldon Helps Penny

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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Sheldon and Injured Penny

With Leonard gone, Sheldon helps an injured Penny. She looks a little loopy here.
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Picking Up Sheldon

Leonard and Penny act as parents as they go to pick up Sheldon from the comic book store.
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Sheldon Visits Penny

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 and Leonard Play Cards

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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Leonard and Penny in Bed

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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Penny Ruins Oatmeal Day

When Penny spends the night at Leonard's she ends up ruining oatmeal day by cooking french toast. How dare she?
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Sheldon Uses Positive Reinforcement

When Leonard tells Sheldon he needs to use more honey than vinegar on Penny, he tries an experiment where he uses chocolate as positive reinforcement on Penny. Amazing.
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TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?