Howard: That was amazing, Sheldon.
Stuart: How did you know that?
Sheldon: It was simple. I combined a well-known historical fact about Bohemia with the memory of my grandparents, Mee-Maw and Pop-Pop, singing Christmas carols while I sat in front of the fire and tried to build a high-energy particle accelerator out of Legos.
Leonard: Okay, continuing our quest.
Sheldon: Wait. There's still four more verses. You don't sing a song and not finish it.
Hither, page, and stand by me, if thou know'st it, telling. Yonder peasant, who is he? Where and what his dwelling? Brightly shone the moon that night, though the frost...

Raj: I don't like bugs, okay. They freak me out.
Sheldon: Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.

Sheldon: Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and as it always has, rock crushes scissors.

Sheldon: Why are you crying?
Penny: Because I'm stupid.
Sheldon: That's no reason to cry. One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.

Raj: Oh man, first monster I see I'm gonna sneak up behind him, whip out my wand and shoot my magic all over his ass!
Stuart: Do you hear yourself when you say these things?

Raj: Doesn't anyone have a rod of resurrection? Because if you've got one, I need it bad. Get in here with your rod and give it to me.
Stuart: Okay, you need to say these things in your head before you say them out loud.

Sheldon: Fun? Mixing Dungeons and Dragons with Christmas is like making a sandwich of grape jelly, the best-tasting jelly, and petroleum jelly, the worst-tasting jelly.