The Big Bang Theory: Season 2, Episode 13

The Friendship Algorithm (19 Jan. 2009)

TV Episode  |  TV-14  |   |  Comedy
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Ratings: 8.2/10 from 1,477 users  
Reviews: 1 user | 1 critic

Sheldon tries to make friends with Kripke in the hope that it will get him access to a coveted computer in the lab.



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Episode complete credited cast:
Penny (as Kaley Cuoco)
Jane Galloway Heitz ...


Despite being unlikeable, Barry Kripke has someone who wants to be his friend: Sheldon. The only reason Sheldon wants to be his friend is to have access to the open science grid computer which Barry controls. Sheldon isn't having any luck befriending Barry in his usual friend making way, so he, approaching this task from his usual intellectual manner, asks his current friends to complete a questionnaire on why they are his friends. Still approaching the task on an intellectual level, Sheldon decides to use traditional friend making approaches, such as going out for food, for a hot beverage or to participate in a common interest. Sheldon has to find the right meeting point that offends his sensibilities the least. But does Sheldon have room in his life for one more friend, especially of the Barry variety? Written by Huggo

Plot Summary | Plot Synopsis




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Release Date:

19 January 2009 (USA)  »

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Did You Know?


The scene where Sheldon tries to befriend the little girl in the bookshop is used in a training film by London's Metropolitan Police. It is designed to show how people with social disabilities can sometimes be unintentionally inappropriate. See more »


In the bookstore set, a sign on a shelf incorrectly spells "Newbery" Award as "Newberry" Award. See more »


[first lines]
Rajesh Koothrappali: Mmmm! Gentlemen, I put it to you: the worst tapioca pudding is better than the best pudding of any other flavor.
Sheldon Cooper: First off, that is axiomatically wrong because the best pudding is chocolate. Secondly, the organic structure of tapioca makes it a jiggling bowl of potential death. It is extracted from the plant...
Howard Wolowitz:
  • Hey, I'm thinking of growing a mustache.

Leonard Hofstadter: Oh, no kidding. A Fu Manchu, a handlebar, pencil?
Sheldon Cooper: It's extracted from the plant...
Howard Wolowitz: I'm not sure yet. You know, George Clooney has ...
See more »

Crazy Credits

CHUCK LORRE PRODUCTIONS, #237 There's a funny moment in tonight's episode where Sheldon gets stuck on a rock-climbing wall and remarks, "What part of an inverse tangent function approaching an asymptote don't you understand?" I thought it'd be helpful to take a moment and examine that joke. A linear asymptote is essentially a straight line to which a graphed curve moves closer and closer but does not reach. In other words, given a function y=fn(x) with asymptote A, A represents a number that, no matter how big (or, given the function, small) you make x, y will never make it to A. The particular example Sheldon quotes is the inverse Tangent function, or Arctangent, which has two asymptotes. If you graph it, it sort of looks like a horizontal S: [shows a graph of atan x] No matter how big you make x (that is, how far you move to the right), the function is never going to hit that top line (pi/2), and no matter how small x gets (moving to the left), y is never going to be smaller than -pi/2. The more you know, the funnier it gets. See more »


References 2001: A Space Odyssey (1968) See more »


Big Bang Theory Theme
Composed and Performed by Barenaked Ladies
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User Reviews

The Friendship Algorithm is another great episode of "The Big Bang Theory"
28 January 2009 | by (Baton Rouge, La.) – See all my reviews

In this episode, Sheldon tries to make friends with Barry Kripke since Kripke has a computer at the university that Sheldon wants to use. Since Sheldon is not exactly a social butterfly, he passes questionnaires to his friends to find out what they like about him but none of them take it seriously. So Sheldon and Leonard go to a bookstore where Sheldon seems to get along with a pre-teen girl there but since that kind of situation invites danger, Leonard takes Sheldon away. Sheldon does find a suitable children's book that he uses to make a diagram to find out Kripke's interests over the phone. Unfortunately, Sheldon ends up on a loop so Howard draws "least objectionable activity" on the board which turns out to be pretend rock climbing. As Kripke and Sheldon do that, Sheldon suddenly finds out he's afraid of heights and passes out! Luckily, he has a harness on him so he can be lowered down. With Kripke a new friend, Sheldon has to drop one of his five. Howard hopes it's him and Penny, not being "one of the boys" thinks it's her but it's Raj who incorrectly answered one of the questions. He gets back in, however, when Barry reveals he doesn't control the schedule and besides, Raj likes monkeys...This was another hilarious episode. Loved the beginning when Sheldon and Raj argue over favorite pudding and when Sheldon tries to explain his side, everyone else mentions Howard's wanting a mustasche while Sheldon hyperventilates! We also find out Sheldon doesn't like whistling so when he's gone, Leonard, Howard, and Raj do that to "Sweet Georgia Brown" which gets a huge applause from the studio audience. That was a great scene. One more thing, when Kripke flirts with Penny and they introduce each other, he doesn't like her name and suddenly calls her "Roxanne". Howard then says sotto voice, "Guess I'm not so bad after all." which gets a smirk from Kaley Cuoco that was probably out of character. It works, though, so it's all good! So on that note, The Frindship Algorithm was another excellent episode of "The Big Bang Theory."

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