Even at Star Trek conventions, they only let him in if he helps set up!

Sheldon [about Wil Wheaton]

Gee, I don't know if I should drink more. I have to drive home and I've got enough trouble seeing over the dashboard as it is.

Bernadette

Well, if it isn't Wil Wheaton, the Jar-Jar Binks of the "Star Trek" universe.

Sheldon

Sheldon: And here's where we are -- the runts in a large litter unlikely to ever reach the nourishing teats of Indiana Jones.
Leonard: So it's good we stopped for dinner.

Penny: Okay, help me out here. How does an archeology professor get that good with a whip?
Wolowtiz: Maybe he took a class at the adult book store. That's how I learned.

I'm guessing 21 seconds had something to do with that, too.

Wolowitz

I find zombies dancing in choreographed synchronicity implausible. And also it's really scary.

Sheldon

No, Gorn, no! That's where I sit.

Sheldon

Please don't send me back to India! It's so crowded. It's like the whole country is one endless Comic-Con, except everyone's wearing the same costume -- Indian Guy.

Raj

Leonard: Hi. I'm Leonard. You are beautiful. You pop, sparkle and buzz electric. I'm going to pick you up at eight, show you a night you will never forget.
Raj: Where are we going?

I don't like the Olive Garden. They treat me like family.

Sheldon

If we're changing topics, I believe I have dibs with the capybara, a rodent the size of a baby hippo.

Sheldon

The Big Bang Theory Season 4 Quotes

You have broad hips and a certain corn-fed vigor. Is your womb available for rental?

Sheldon

At best, it's a modest leap forward from the technology that gave us Country Bear Jamboree.

Sheldon