Your desperate need for friendship makes you weak.

Sheldon

Penny: We're keeping things, you know, homeostasis.
Amy: It's so cute when she tries.

Sheldon: Penny? Please don't hurt my friend.
Penny: That is the last thing I want to do.
Sheldon: Thank you.

Leonard: The guy who seems like an emotionless robot ... is you, but your relationship with Amy is causing you to transform into a red-blooded man with sexual desires.
Sheldon: That is literally the stupidest thing I've heard.

Sheldon: Wolowitz when to MIT. What's your educational background?
Stuart: I went to art school.
Sheldon: Equally ridiculous. Let's go.

Whenever I'm around Sheldon, I feel like my loins are on fire. In the good way. Not in the urinary tract infection way.

Amy

Raj: Stuart, you want to hang out tomorrow night? Maybe grab a bite to eat or catch a late movie?
Stuart: Yeah, I would like to, but I'm a little light on funds.
Raj: No problem. My treat, I'll swing by after work.
Stuart: [watches Raj leave] I could do worse.

Raj: What are you drinking?
Stuart: Coffee liquor in a Chewbacca mug. I call it a Sadtini.

Raj: Sorry I started without you. I'm a little nervous. It's been a long time since I've been on a date.
Amy: I can't believe I bleached my mustache for this.

Amy: Soon my upper lip will be the same fake blonde as my beautiful best friend.
Penny: Hey, this is my natural hair color - Now.

Right now, Howard is staring down on our planet like a Jewish Greek god - "Zuesawitz".

Raj

The Big Bang Theory Season 6 Quotes

Raj: You got this buddy.
Leonard: Yeah, come on, Howard. Hook that worm.
Raj: You can do it.
Penny: That's great. Cheerleading. Way to man things up.

Death by chicken. That's a pretty fowl way to go.

Howard