Howard: Forty-three. What is forty-three? Besides my mom's neck size.
Raj: It's the atomic number for technetium.
Howard: That stuff's radioactive.
Raj: Do you think he's building a bomb?
Howard: It took him two years to put together that Lego Death Star. I'm not worried.

Howard: You know, I'm really glad you decided to learn Mandarin.
Sheldon: Why?
Howard: Once you're fluent, you'll have a billion more people to annoy instead of me.

Howard: I invented a game. Want to play?
Leonard: Sure.
Howard: It's called Emily or Cinnamon. I give you actual quotes I've heard Raj say, and you guess if he was talking to his girlfriend or his dog.

Bernadette: Does your mother call you every day at work to see if you had a healthy lunch?
Howard: My mother calls me every day at work to see if I had a healthy bowel movement.

Sheldon: You may not realize it, but I have difficulty navigating certain aspects of daily life. You know, understanding sarcasm, feigning interest in others, not talking about trains as much as I want. It's exhausting!

Sheldon: I'm not saying you don't have attractive qualities. Your choice of friends is impeccable, you're a good sleeper, and last but not least, you buy the grapes I like. You're a real catch compared to some snoring guy with a fridge full of lousy grapes.

Sheldon: (Playing hackey sack) One, two, three, four, five, six, seven, eight. Drat. I'm never going to get to forty-three again. One, two, three, four. Rats.