Sheldon: You just lied to Penny.
Leonard: Yes, I did.
Sheldon: And you did it so casually. No rapid breathing, no increase in perspiration.
Leonard: So?
Sheldon: So, lack of physiological response while lying is a characteristic of a violent sociopath.
Leonard: Sheldon, are you worried about your safety?
Sheldon: No. I imagine if you were going to kill me, you'd have done it a long time ago.

Leonard: See, the liquid metal Terminators were created in the future by Skynet, and Skynet was developed by Miles Dyson, but that future no longer exists due to Dyson's death in Terminator 2.
Sheldon: Okay, then riddle me this. Assuming all the good Terminators were originally evil Terminators created by Skynet but then reprogrammed by the future John Connor, why would Skynet, an artificial computer intelligence, bother to create a petite hot 17 year-old killer robot?
Leonard: Skynet is kinky? I don't know.
Sheldon: Artificial intelligences do not have teen fetishes.

Penny: Alright, remember when I auditioned for that workshop production of Rent, but I didn't get it and I couldn't figure out why?
Sheldon: I have a conclusion based on an observation.
Leonard: No, you don't. No he doesn't.

Sheldon: Never mind. I clearly woke you up in the middle of a REM cycle. You're in no state to talk.

Sheldon: Remember how Leonard told you we couldn't come to your performance because we were attending a symposium on molecular positronium?
Penny: I remember symposium.
Sheldon: Yes, well, he lied.
Penny: Wait, what?
Sheldon: He lied, and I'm feeling very uncomfortable about it.
Penny: Well imagine how I'm feeling.
Sheldon: Hungry? Tired? I'm sorry this really isn't my strong suit.

Leonard: You told her I lied? Why would you tell her I lied?
Sheldon: To help you.
Leonard: I'm sorry, I'm not seeing the help.
Sheldon: She was going to see through your lie eventually, so I told her that you were lying to protect me.
Leonard: Oh, I'm getting a bad feeling.
Sheldon: Hunger? Indigestion? I'm sorry. I'm really not very good at this.

Sheldon: Anyway, Penny now believes that on Friday night, we're going to participate in my cousin Leopold's drug intervention.
Leonard: Your cousin Leopold?
Sheldon: Yea, who most people call Leo, but he also answers to Lee. Remember that, it's important.
Leonard: What's important?
Sheldon: Details, Leonard. The success or failure of our deceitful enterprise turns on details.

Leonard: Do you have a cousin Leopold?
Sheldon: No, I made him up. I think you'd call him Lee.
Leonard: I don't get it. I already told her a lie. Why replace it with a different lie?
Sheldon: Well, first of all, your lie was laughably transparent, where mine is exquisitely convoluted. While you were sleeping I was weaving an un-unravelable web.
Leonard: un-unravelable?
Sheldon: Yes, if she Googles "Leopold Houston" she'll find a Facebook page, an online blog depicting his descent into drug use, and a desperate yet hopeful listing on e-Harmony.com.

Leonard: Okay. Why would I go to a drug intervention for your cousin?
Sheldon: Ah, because it's in Long Beach, and I don't drive.
Leonard: We're going to Long Beach?
Sheldon: No, of course not. Theres no cousin Leo, theres no intervention. Focus, Leonard.

Sheldon: We just leave the house on Friday night, and we return in the wee hours emotionally wrung out from the work of convincing Leo to go back into rehab.
Leonard: So he goes back into rehab?
Sheldon: Yes. But he can relapse if Penny ever invites us to go hear her sing again.
Leonard: You still told her I lied.
Sheldon: For a noble purpose, to spare me the social embarrassment of having a drug-addled first cousin, which I'm assuming is embarrassing, yes?
Leonard: I don't know. How am I supposed to remember all of this?
Sheldon: That's the best part. You don't have to. See, I told Penny that you would be embarrassed if you knew that she found out that you had lied. So she's agreed to operate as if the original lie was still in force.
Leonard: So she's expecting me to lie about going to a symposium in Pasadena, when in actuality we're pretending to go to a drug intervention in Long Beach?
Sheldon: Un-unravelable.

Leonard: Who are you?
Toby: I am Sheldon's cousin Leo.
Leonard: Oh, God! Sheldon does not have a cousin Leo.
Toby: Au contraire. I'm 26 years old. I'm originally from (reads off character profile) Denton, Texas, but I was a Navy brat so I was brought up on a variety of military bases around the world. As a result, I've often felt like an outsider, never really fitting in, which is probably the reason for my substance abuse problem.
Sheldon: Excuse me, we just went over this. As the quintessential middle child, your addiction is rooted in your unmet need for attention.
Toby: Oh, Sheldon, are we really going to go with pop psychology.

Sheldon: No. We're going with middle child and a generic predisposition to inadequate serotonin production.
Toby: Swell, how do I play genetic predisposition?
Sheldon: Sub-textually, of course.

Leonard: You are not Isaac Newton.
Sheldon: No, no, that's true. Gravity would have been apparent to me without the apple.

Leonard: Sheldon, why is this letter in the trash?
Sheldon: Well, there's always the possibility that a trash can spontaneously formed around the letter, but Occam's Razor would suggest that someone threw it out.

Leonard: Oh, geez, does this suit really look that bad?
Sheldon: Forget your suit. Look at my arms flailing. I'm like a flamingo on Ritalin.