*Leonard's phone vibrates*
Leonard: Oh, God.
Professor Proton: What is it?
Leonard: Sheldon just sent me a picture of him and Bill Nye getting smoothies.

Amy: I've never seen him (Sheldon) this happy before.
Leonard: That's because you've never seen him on "Restock the Medicine Cabinet" day.

Leonard: Ooh, Gasex has a new ultra-strength. I guess they really do read their mail.

Sheldon: Hey, isn't that Professor Proton?
Leonard: Oh, yeah.
Sheldon: Look at him just standing in line, like he wasn't moderately famous thirty years ago.
Sheldon: Let's go say hello.
Leonard: Oh, maybe we shouldn't bother him.
Sheldon: I'm not going to bother him. I'm going to talk to him.
Leonard: He thinks there's a difference.

Raj: Leonard, give me a beat.
Leonard: I will not.

Sheldon: How do I make them stop loving me?
Leonard: You could invite them to live with us.

Penny: Bernadette is going to love this.
Leonard: Yeah, it must be nice to have somebody do something so romantic.
Penny: Okay, you know what's not romantic? Rubbing it in someone's face.
Leonard: Actually, it can be. But I told you sex doesn't count.

Leonard: People get things they don't deserve all the time. Like me with you.

Penny: Just you wait and see. I'm gonna romance your freakin' ass off.
Leonard: That's beautiful. Is that Shakespeare?

Howard: So I'm almost done writing the song for Bernadette. Are you cool playing the cello?
Leonard: If by cool you mean willing to, yes. If by cool you mean cool, clearly you've never seen me play the cello.

Penny: Sheldon, you wanna take a break? Your food's ready.
Leonard: What are you doing? He's both happy and quiet. It's like seeing a unicorn and big foot at the same time.

Leonard: Sheldon, I've known you a long time. I'm going to tell you this with all the love I can possibly muster. Amy's right, you're wrong.
Sheldon: But you don't even know -
Leonard: It doesn't matter.
Sheldon: But in my defence -
Leonard: Doesn't matter!

Sheldon: I appreciate your concern but I won't be seeing any more of Amy than I already do. I assume we'll deduct any extra time I see her at work from our weekly quota.'
Leonard: Please let me be there when you tell her that.
Sheldon: Why? So you can see the look on her face when she hears my top notch idea?
Leonard: Please, oh please, just let me be there.

Sheldon: You've spent time with Amy, can you think of anything she's fond of that has a bunch of flaws she hasn't noticed?
Leonard: ... I got to go.

Penny: I just want to know why a five-year-old boy puts on his mom's make-up and wears balloon boobies.
Leonard: They weren't boobies, they were muscles. And the make-up was green, I was pretending to be The Hulk.
Penny: You were wearing her bra.
Leonard: That was to keep my muscles from sagging. Can we please stop talking about this?!