Leonard: So it's just flirting?
Penny: Yeah, why?
Leonard: No reason, I just think it's sexier when things are left to the imagination.
Amy: (to Sheldon) He's wrong.

Sheldon: Leonard, do you think I'm funny?
Leonard: No. Do you?
Sheldon: I think I'm hysterical.
Leonard: I take it back. That was funny!

Bernadette: So how come you two (Leonard & Raj) didn't move in together?
Leonard: This guy wanted a place of his own because he was sure he was going to be a ladies' man.
Raj: Yeah, I was wrong.

Leonard: He made you his screensaver.
Amy: Oh, wow. I had no idea. He is so into me!

Amy: I'm just really glad you're back.
Sheldon: Me too. I've got a lot of TV to catch up on.

Amy: I missed you.
Sheldon: To quote Han Solo, "I know."
Amy: Did you miss me?
Sheldon: I would have preferred to have you there with me.
Amy: Aww.
Sheldon: Or instead of me.

Amy: Did you hold the baby?
Sheldon: I did.
Amy: And how did it make you feel?
Sheldon: Looking into the blank, innocent eyes of a creature that couldn't begin to comprehend anything I was saying ... basically another day at the office.

Leonard: Hey, Sheldon sent us all an email. "Happy Holidays from Texas", and there's pictures. *Looks at his phone* Aww, do not open them. Do not open them!
Penny: Oh come on, childbirth is a natural, beautiful - Urgh, it's like someone sawed a cow in half.
Raj: My father is a gynaecologist, I think I can handle it. *Looks at his phone* And ... now I'm gay.

Penny: Doing laundry?
Sheldon: Of course I'm doing laundry. Saturday night is laundry night and I'm in a laundry room, so I believe your inference is justified.
Penny: Oh, "My inference is justified", Sheldon you are so funny!

Amy: Here's another one. Penny, if it weren't for Sheldon, you never would have met comic book legend Stan Lee.
Penny: Great.

Raj: At least Leonard, Howard and I would have always been friends.
Bernadette: Hey, how come you three never got an apartment together?
Leonard: We talked about it, but Howard was in a pretty serious relationship ... with his mom.

Howard: I lived with her to save money.
Raj: Yeah, you didn't need to buy groceries because you were breast feeding.

Leonard: Uhh, umm. I'm Leonard.
Penny: Really? You don't sound so sure.
Leonard: No, I am me.

Sheldon: I've seen things. Lady things.
Amy: Listen to me. That is not the way they usually look!

Sheldon: This is no way to make new humans. People coming out of people. Like some dirty magic show.