Raj: I'm being a good houseguest.
Howard: No, you're being a better husband than I am.

Howard: She spends half the time licking her butt.
Raj: And the other half licking my face.

Howard: If I may, he has so little self-respect and is so desperate for the smallest crumb of affection, she could literally sleep with his own father in his own bed and post the video to YouTube, and he'd still buy her flowers and ask her to be his bride.
Raj: He's right.

Sheldon: It's great you're here. I'd love to get an engineer's opinion.
Howard: Sure.
Sheldon: This chair is squeaky. Now, do I fix it or get a new one?

Look who's here to put the Jew in jewelry night.

Howard: Can you imagine seeing someone all day long and then you're supposed to hang out with them after work, too?
Raj: Hold on. We do that all the time. You and I work together and play together.
Howard: Yeah, I know, and it drove me into the arms of another woman.

Howard: Wait. Wait. If it wasn't for Indiana Jones, the ark would never have ended up at the warehouse!
Sheldon: (gasps) That's true! He collected and delivered the ark to the proper authorities for filing.
Raj: Like a hero.
All: Yeah! Right! Yes!
Leonard: Although, technically, Indy was supposed to take the ark to a museum to be studied. He couldn't even get that done.
All: Aww.

Sheldon: To the planetarium!
Penny: Let's go!
Leonard: To the Tar Pits!
Bernadette: Let's go!
Amy: There's a Neil Diamond concert next month.
Howard: Let's go!

Howard: No, I am definitely up a cup size.
Raj: You, know, b-but they're very firm, so you've got that going for you.
Howard: You think?
Raj: Yeah. Yeah. Yeah. Very perky.
Howard: Thank you. I really needed to hear that today.

Hey, easy. My nipples are sensitive.

I need you to be honest with me. Do my boobs look bigger to you?

Howard: I feel so stupid. And fat.
Bernadette: That's okay. You still look great to me. In fact, why don't we go in the bedroom and I'll prove it to you?
Howard: Sex? Really? That's just your solution for everything.

TBBT Quotes

Sheldon [to Kripke]: Also, I am given to understand that your mother is overweight.
Raj: Oh, snap.
Sheldon: Now of course, if that is the result of a glandular condition and not sloth and gluttony then I withdraw that comment.

How is "doable" anything but a compliment?

Wolowitz