Leonard: We'll miss you Sheldon.
Sheldon: Yeah, well, who wants to spend the whole weekend, running around a bunch of pretend planets, battling made up monsters? That's for babies.
Howard: Yeah, but it's got lightsabers.
Sheldon: Please, Amy! It's got lightsabers!

She's 93. She won't be disappointed for very long.

Sheldon

Leonard: It will be like our World of Warcraft party a few years ago when the neighbors called the cops on us.
Howard: They called the cops because of the smell. They thought we were dead.
Raj: We were badass back in the day.
Leonard: All right, let's do it.
Howard: 48 hours of Star Wars gaming.
Raj: It's on like Alderaan.

Raj: Hey, want to spend some time playing the new Star Wars game this weekend?
Leonard: Oh, I don't know. I kinda promised myself I'd get off the computer, be more physically active, get some exercise....?
Howard: You're about to walk up three flights of stairs.
Leonard: Good point. I'm in.

Penny: Please come home and let me cut your hair.
Sheldon: Amy what do you think?
Amy: There's not a hair on this body I wouldn't let this woman trim.

Penny: Where are you going?
Sheldon: Where ever the music takes me kitten.

Penny: Why did you get bongos?
Sheldon: Richard Feynman played bongos, I thought I would give that a try
Leonard: Richard Feynman was a physicist
Penny: It's three o'clock in the morning, I don't care if Richard Feynman was a purple leprechaun that lived in my butt!

Bernadette: You're so brave, I'm proud of you
Howard: I ate a butterfly. It was so small, beautiful.... I was so hungry.

Penny: Ok, what just happened?
Leonard: I don't know. Between you playing chess like Bobby Fischer, and Sheldon being ok with you in his spot, I'm guessing someone went back in time and changed the course of human events.

I gotta run...[stops] but not with scissors, that would be unsafe.

Sheldon

Amy: What about Supercuts?
Sheldon: I tried it once; they cut men and women hair at the same time in the same room. It's like Sodom and Gomorrah with mousse.

Penny: I use to cut my brother's hair. I could do it for you
Sheldon: I know you mean well, offering the skills of the hill folk, but here in town we don't churn our own butter, we don't make dresses from gunny sacks, and sure-as-shootin don't get our hair cut by bottle blon..
Leonard: Sheldon be nice!

The Big Bang Theory Season 5 Quotes

You can't blame yourself. When your prefrontal cortex fails to make you happy promiscuity rewards you with the needed flood of dopamine. We, neurobiologists, refer to this as the skank reflex.

Amy

I feel like two totally different people. Dr. Jekyyl and Mrs. Whore.

Penny