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.
Penny: Oh, okay, look. THIS. NEVER. HAPPENED. Do you understand me?
Penny: Really?! Still can't talk to me?!
Sheldon: Here's an interesting fact about alcohol ... Man is not the only species that ferments fruit in order to become intoxicated. Can you guess what the other is? Hint: sometimes they pack the alcohol in their trunks.
Sheldon: When does a monkey have a trunk?
Penny: When a suitcase just won't do
Much later - Sheldon: And the answer was elephant.
Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.
Bernadette: The thesis committee accepted my doctoral dissertation. I'm getting my Ph.D!!
(the other congratulate her)
Penny: Wow! So that means that....(points around the table to all the Ph.D's) You're a doctor, you're a doctor, you're a doctor, YOU'RE a doctor, and Howard....you know a lot of doctors!!
(To a box of expensive shoes she's about to take back)
Penny: I'm sorry, shoes, but you have to go back.
Shoebox (Penny): But, Penny, we love you.
Penny: I love you, too, but you cost more than my rent.
Shoebox (Penny): But Penny, you look so good in us.
Penny: (To Amy) Damn it, the shoes are right!
Priya: They dressed up in leotards and goggles and called themselves the New Delhi Power Rangers.
Penny: How old were they?
Priya: Not as old as you'd want them to be.
Sheldon: Do you know where the phrase jibber jabber comes from?
Penny: Oh my god, you're about to jibber jabber about "jibber jabber?"
Ooh, these are cute. Of course if I buy them, I'll have to rent my womb out to a gay couple.
Penny: All right, try thinking about this -- Sheldon and Amy had sex.
Raj: Shut your ass.
Today's the day a girl's finally going to touch you in your little special place.
You know, for the first couple of months, whenever I would take off my bra, he would giggle and say 'oh, boy, my breast friends!'Penny [referring to Leonard]