Howard: [engine starts] Check it out. [engine revving] That there, son, is 12 horses of "eye-talian" thunder.

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.

Bernadette: Why do you want to ride that stupid thing anyway?
Howard: I don't know. Maybe I just miss the freedom I had as a younger man.
Bernadette: What freedom? You lived with your mother. You had a curfew.

Howard: This is a twist. Usually you're the one getting called into H.R.
Raj: Yeah, now it's Amy. Who knew you were married to such a bad girl.
Sheldon: I suppose the signs were always there. I mean, she did recently go to that rave at the mall.
Amy: It was a Spencer's Gifts.
Sheldon: There was music and a strobe light. If that isn't a rave, then I don't know what one is.
Leonard: You don't know what one is.

Amy: Guys, come on, I think I'm in trouble.
Howard: It's no big deal. I used to get called into H.R. all the time. Ms. Davis is great. Pro tip: if you find strong women sexy, do not say it out loud.