As usual, Leonard and Penny get into an argument. This time? About psychics.
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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 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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TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

Howard: Attention people of Earth: Tonight, there will be two moons in the sky.