... with the whiter-than-Marshmallow-Fluff Leonard Hofstadter.

Sheldon

I understand the alcohol has stirred up whatever it is that makes girls go wild ... but I really need to talk to smart Amy right now.

Sheldon

The real danger is him biting off my face while I'm sleeping.

Amy

I kissed a girl and I liked it. I hope my boyfriend don't mind...

Amy singing

Irrelevant. Leonard doesn't trim his nose hair. He thinks because he's short, no one can see up there.

Sheldon

Oh, cool, I've got a lawyer and I've seen her naked.

Leonard

Leonard, let the man pee.

Priya

Her freakishly small hands make anything look big. That's one of the reasons I love her.

Howard

Oh, Bernadette, please play my clarinet.

Raj's poem

And for years, everyone in my family was convinced that he was the clarinet enthusiast.

Priya

Everyone was set a-twitter. Although oddly, no one tweeted.

Sheldon

Penny: All right, try thinking about this -- Sheldon and Amy had sex.
Raj: Shut your ass.

The Big Bang Theory Season 4 Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

Raj: Well, to paraphrase Shakespeare: It's better to have loved and lost than to stay home every night and download increasingly shameful pornography.
Penny: Oh... you poor baby.
Raj: What's wrong with me, Penny?
Penny: Nothing, nothing. You know, if we weren't friends - and you hadn't brought up that creepy pornography story - I'd be on you like the speed of light squared on matter to make energy.
Raj: Hey, you totally got that right. E = MC squared.
Penny: I listen. I have no idea what it means, but I listen.