Penny and Leonard come outside to see Sheldon trapped by a net from the security system they installed.
Added:
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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After years of trying to get his mother's affection, Leonard finally gets a hug from Beverly (Christine Baranski). All it took was getting her drunk.
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Bernadette (Melissa Rauch) joins the guys for lunch at work as she begins to bond with Leonard over his work.
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Wolowitz confronts Leonard when he gets jealous over his friend bonding with his girlfriend, Bernadette.
Added:
When Sheldon is embarrassed by Kripke on National Public Radio, Sheldon comes to comfort his friend.
Added:
Raj attempts to scare the guys with a ghost story but they look a little more bored than scared.
Added:

TBBT Quotes

Two tea bags in one cup? You're not at a rave.

Sheldon

Raj: Okay, here's another one: if a zombie bites a vampire, and the vampire bites a human, does the human become a vampire or a zombie? Or, a zompire?