This episode is the first to show the inside of Penny's apartment (completely) for the first time.
This episode establishes that Sheldon is almost completely incapable of detecting sarcasm.
It is revealed that Howard is allergic to peanuts, and Sheldon is allergic to bees.
Penny: In my apartment, while I was sleeping!
Sheldon: And snoring, and that's probably just a sinus infection, but it could be sleep apnea; you might want to see an otolaryngologist.
(Penny stares at Sheldon)
Sheldon: The throat doctor.
Penny: And what kind of doctor removes shoes from asses?
Sheldon: Depending on the depth, that's either a proctologist or a general surgeon.
(Leonard holds up a piece of paper on which he has written "SARCASM")
Sheldon: Excuse me, explain to me an organizational system where a tray of flatware on a couch is valid? Now, I'm just inferring that this is a couch, because the evidence suggests that the coffee table is having a tiny garage sale.
Leonard: If you don't have any other plans, do you want to join us for Thai food and a Superman movie marathon?
Penny: A marathon? Wow, how many Superman movies are there?
Sheldon: You're kidding, right?
Leonard: I guess we'll just bring it up ourselves.
Sheldon: I hardly think so.
Leonard: Why not?
Sheldon: Well, we don't have a dolly, or lifting belts, or any measurable upper-body strength.
Leonard: We don't need strength. We're physicists. We are the intellectual descendants of Archimedes. Give me a fulcrum and a lever, and I can move the Earth. (Trying to move the box) It's just a matter of... I don't have this. I don't have this. I don't have...
Sheldon: Archimedes would be so proud.
Sheldon: You do understand that our efforts here will in no way increase the odds of you having sexual congress with this woman?
Leonard: Men do things for woman without expecting sex.
Sheldon: Those would be men who just had sex.
(they've lain Penny's box on the stairs)
Leonard: Now we've got an inclined plane. The force required to lift is reduced by the sine of the angle of the stairs. Call it 30°, so about half.
Sheldon: Exactly half.
(Cleaning and organizing Penny's apartment at night)
Sheldon: I couldn't sleep knowing that just outside my bedroom is our living room and just outside our living room is that hallway and immediately adjacent to that hallway is this! (showing Penny's messed up apartment)
Leonard: Do you realize if Penny wakes up there's no reasonable explanation to why we are here?
Sheldon: I just gave you a reasonable explanation.
Leonard: No, no. You gave me an explanation. Its reasonableness will be determined by a jury of your peers.
(everyone's trying to assemble Penny's new TV stand, reading the instructions)
Wolowitz: Oh, boy! I was afraid of that!
Wolowitz: These instructions are a pictographic representation of the least imaginative way to assemble these components. This, right here, is why Sweden has no space program!
Wolowitz: (after doing Dance Dance Revolution) Grab a napkin homey, you just got served.
Sheldon: (in a very low voice, that is almost robotic) If you have time to lean, you have time to clean.
Sheldon: Oh, gravity, thou art a heartless bitch.
The German episode title is "Chaos-Theorie". The French title is "Des voisins encombrants", meaning "Inconvenient Neighbors". The Italian title is "L'ipotesi del cervellone", meaning "The Brain Hypothesis". The Spanish and Mexican title is "La hipótesis del gran cerebro", meaning "The Big Brain Hypothesis".
Original International Airdates:
Turkey: September 16, 2008 on CNBC-e
Czech Republic: April 14, 2009 on Prima COOL
Germany: July 18, 2009 on ProSieben
Slovakia: August 18, 2011 on Markiza
This episode's end titles have Chuck Lorre's Vanity Card #184.
The book that Leonard is holding in Penny's apartment is The Secret by Rhonda Byrne.
Seeing Penny's chaotic apartment, Sheldon exclaims, "Great Caesar's ghost, look at this place," borrowing the exclamation that the editor of the Daily Planet, Perry White, often uses in Superman media.
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