I love The Big Bang Theory so much. Like most, Sheldon is my favorite character. I'm a little bit ashamed to say that I don't follow the guys conversations when they are nerding out. Which is pretty much all the time. I have to get Martin to translate to me. My favorite example of when he had to translate would be from this clip.
My favorite episode would be The Terminator Decoupling. I love the conversation that Sheldon and Penny have on the phone.