We learn Howard is 26 years old.
Mrs. Wolowitz: Howard, it's the phone!
Howard: I know it's the phone, Ma, I hear the phone.
Mrs. Wolowitz: Well, who's calling at this ungodly hour?!
Howard: I don't know.
Mrs. Wolowitz: Well, ask them why they're calling at this ungodly hour!
Howard: How can I ask them when I'm talking to you?!
Sheldon: (handing Leonard a measuring cup) Put this in the bathroom.
Leonard: What for?
Sheldon: I need to measure my fluid intake and output to make sure my kidneys aren't shutting down.
Leonard: I mix pancake batter in this!
Sheldon: No, that measuring cup has always been for urine.
Leonard: You had time to make a label for everything in this apartment, including the label maker, but you didn't have ten seconds to make one that said "urine cup"?
Sheldon: (flips the measuring cup over to show Leonard) It's right here on the bottom.
Leonard: Huh. I guess I owe the Betty Crocker company a letter of apology.
Leonard: How was Nebraska?
Penny: Oh, better than North Dakota! (pause) I guess that joke's only funny in Nebraska.
Sheldon: From the data at hand you really can't draw that conclusion. All you can say with absolute certainty is that that joke is not funny here.
Penny: Boy, it's good to be back.
Sheldon: If influenza was only contagious after symptoms appear, it would have died out thousands of years ago. Somewhere between tool using and cave painting, Homo habilis would have figured out to kill the guy with the runny nose.
Penny: You deliberately stuck me with Sheldon!
Leonard: Come on, I had to. You've seen what he's like.
Sheldon: (from inside his room) Penny? Penny, I'm hungry!
Penny: It's okay, sweetie! Good news! Leonard's home!
(Penny hands him a small bottle of Vick's VapoRub)
Penny: Here you go. Good luck.
Sheldon: Anyway, the housekeeper in the faculty residence didn't speak any English. When I finaly managed to convince her I was sick, she said, "Möchtest du eine Darmspülung?"
Penny: What does that mean?
Sheldon: Based on what happened next, I assume it means, 'Would you like an enema?'
Leonard: Alright, get some rest and drink plenty of fluids.
Sheldon: What else would I drink? Solids? Gases? Ionized plasma?
Leonard: Drink whatever you want.
Leonard: Argh, again?
Sheldon: Obviously you're not well-suited for three-dimensional chess. Perhaps three-dimensional Candyland would be your speed.
Sheldon: (to Leonard on 3D chess) It must be humbling to suck on so many levels.
Leonard: Sheldon, don't you think you're overreacting?
Sheldon: When I'm lying comatose in a hospital, relying on inferior minds to cure me, these Jell-O cultures and my accompanying notes will give them a fighting chance.
(at The Cheesecake Factory)
Penny: Why didn't you just have soup at home?
Sheldon: Penny, I have an IQ of 187. Don't you imagine if there were a way for me to have soup at home, I would have thought of it?
Penny: You can have soup delivered.
Sheldon: I did not think of that.
Sheldon: (on studying in Germany) The local cuisine was a little more sausage-based than I'm used to, and the result was an internal blitzkrieg, with my lower intestine playing the part of Czechoslovakia.
The German episode title is "Alles fließt", meaning "Everything Flows". The French episode title is "Alerte aux microbes", meaning "Germ Alert". The Italian title is "L'anomalia della pastella per le frittelle", the Spanish title is "La anomalía de la masa de tortitas", both exact translations. The Mexican title is "La anomalía del plato de panqueque", meaning "The Plate of Pancakes Anomaly".
International Airdates: Turkey: November 25, 2008 on CNBC-e; Czech Republic: June 16, 2009 on Prima COOL; Germany: September 5, 2009 on ProSieben; Slovakia: September 2, 2011 on Markiza
This episode was part of the show's Emmy Awards 'For Your Consideration' DVD for this season.
This episode's end titles has Chuck Lorre's Vanity Card #200.
The three-dimensional chess that Sheldon and Leonard play during the teaser is from a game played on the original Star Trek.
Sheldon refers to Penny as "Typhoid Penny", comparing her to Mary "Typhoid Mary" Mallon, a cook whose denial that she could be carrying typhoid fever—yet be healthy herself—led to the infection of 47 people, with 3 of them dying.
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