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.
Added:
Sheldon helps decorate the tree and wants to add the bust of Sir Isaac Newton, which he argues is more Christmasy than Jesus.
Added:
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.
Added:
Bernadette (Melissa Rauch) joins the guys for lunch at work as she begins to bond with Leonard over his work.
Added:
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

I was expecting applause but I suppose stunned silence is equally appropriate.

Sheldon

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.