(walking into the comic book store)
Penny: Everbody's staring at me.
Leonard: Don't worry, they're more scared of you than you are of them.
(inside the bar, referring to hitting on women)
Howard: You can't just tell a falcon when to hunt.
Leonard: Actually, you can! There's a whole sport built around it: falconry.
Sheldon: Would you like some advice?
Leonard: Sure, why not.
Sheldon: Well, then this is the perfect time to launch a blog with an interactive comments section.
Stuart: Sheldon, I'm afraid you couldn't be more wrong.
Sheldon: "More wrong?" Wrong is an absolute state and not subject to gradation.
Stuart: Of course it is. It's a little wrong to call a tomato a vegetable; it's very wrong to say it's a suspension bridge.
Raj: The Wolowitz Coefficient?
Howard: Neediness x (dress size)².
Leonard: Howard, take me to a bar with women.
Howard: Okay! Let me just go inside and slip off my underwear.
Howard: Well, if I get lucky I don't want to get caught in my Aquaman briefs!
Penny: What would you recommend as a present for a 13-year-old boy?
Stuart: A 13-year-old girl.
Penny: (referring to comic books) I don't know, he's 13, just pick out anything.
Sheldon: "Just pick out anything?" Well, maybe at the same time we could pick out a new suit for him without knowing his size. Or pick out his career for him without knowing his aptitude. Or pick out a new breakfast cereal for him without knowing his fiber requirements.
Penny: You know, it's kind of early. Do you want to, maybe come in for some coffee or something?
Stuart: Oh, gee, it's a little late for coffee isn't it?
Penny: Oh, you think "coffee" means coffee. That is so sweet.
Penny: While you're there, could you pick me up some comics for my nephew's birthday?
Sheldon: I think you mean comic books. "Comics" are feeble attempts at humor featuring talking babies and anthropomorphized pets, found traditionally in the optimistically-named Funny Pages.
Leonard: You're joking!?
Wolowitz: I'm a horny engineer, Leonard. I never joke about math or sex.
This episode's end titles has Chuck Lorre's Vanity Card #248.
The German episode title is "Der Wolowitz-Koeffizient". The French episode title is "Le Bar à filles", meaning "Girl Bar". The Italian title is "L'isotopo di Hofstadter", and the Spanish and Mexican title is "El isótopo Hofstadter".
This was one of the three episodes that were nominated for a 2009 Emmy in the Outstanding Art Direction For A Multi-Camera Series category.
International Airdates: Latin America: May 12, 2009 on Warner Channel; Australia: October 5, 2009 on Channel 9; Germany: December 12, 2009 on ProSieben; Turkey: January 18, 2010 on CNBC-e; Finland: February 22, 2010 on Sub; Czech Republic: November 24, 2010 on Prima COOL; Slovakia: October 11, 2011 on Markiza
Kevin Sussman can also be seen with Simon Helberg in the 2006 movie, For Your Consideration.
When Howard and Sheldon are fighting over the comic at the comic book store and ask Leonard for advice, and he responds with "I don't know, cut it in half", this is a very subtle allusion to a famous Bible story involving King Solomon.
In the story, two women bring a baby to King Solomon, each claiming the child as her own. When Solomon suggests cutting the baby in half, the true mother is revealed.