I'm a horny engineer, Leonard. I never joke about math or sex

Wolowitz

In bars, all across this great nation of ours, Thursday night is Ladies Night. Which means that as the evening progresses, we will get better looking courtesy of 99 cent margaritas and 2-for-1 Jello shots

Wolowitz

You're probably thinking, "the comic book store, on a Thursday? Why I've fallen down the rabbit hole and into a land of madness." What you have failed to take into account, Penny, is that this is "Anything Can Happen Thursday"

Sheldon

Sheldon: More wrong? Wrong is an absolute state and not subject to degradation
Stuart: It's a little wrong to say to say a tomato is a vegetable, it's very wrong to say it's a suspension bridge

Wolowitz: First we let the lawyers and the jock thin the heard, then we go after the weak, the old and the lame
Leonard: That's your system?
Wolowitz: Yeah and if you spot a girl with a seeing eye dog, she's mine

Wolowitz: Okay! Let me just go inside and slip off my underwear.
Leonard: Why?
Wolowitz: Well if I get lucky, I certainly don't want to be caught in my Aquaman briefs.

Leonard: I just don't get what she sees in Stuart, we're practically the same guy
Sheldon: ...Stuart is taller, artistic, self employed, and most importantly, gets 45% off comic books

Penny [to comic book store owner]: What would you recommend as a gift for a 13 year old boy?
Stuart: A thirteen year old girl

Penny [at comic book store]: Everyone's staring at me!
Leonard: Don't worry, they're more scared of you than you are of them
Penny: Unlikely

Raj: The Wolowitz coefficient?
Wolowitz: Neediness times dress size squared

Leonard: But we all agreed the third Thursday of every month will be "Anything Can Happen Thursday"
Sheldon: Apparently the news didn't reach my digestive system, which when startled has it's own version of "Anything Can Happen Thursday"

The Big Bang Theory Season 2 Episode 20 Quotes

Raj: The Wolowitz coefficient?
Wolowitz: Neediness times dress size squared

Leonard: But we all agreed the third Thursday of every month will be "Anything Can Happen Thursday"
Sheldon: Apparently the news didn't reach my digestive system, which when startled has it's own version of "Anything Can Happen Thursday"