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The Longest Running Jokes In 'The Big Bang Theory'

List RulesVote up the jokes that make humor an exact science.

The Big Bang Theory is one of the longest-running sitcoms to ever air on TV. It remains a hilarious watch for fans, especially due to the presence of several recognizable tropes that have an evergreen element of comedy. These include catchphrases, recurring appearances and jokes, and mannerisms. Here are the longest-running jokes on The Big Bang Theory.

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  • 1

    Raj And Howard Acting Like A Couple

    Photo: CBS / Pinterest

    Raj and Howard display an extreme level of codependency, especially in earlier seasons when they're both single. They constantly argue like a married couple, are mistaken for lovers by most characters, and openly admit their love for one another. The joke is perpetuated by Leonard's mother, who's convinced the two are hiding their true feelings for one another the whole time.

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    An exact science?
  • 2

    Sheldon Knocking Three Times On Doors

    Photo: CBS / Pinterest

    Sheldon has a compulsive need to knock on doors three times to announce his arrival, as well as utter the name of the person he wants to meet after each knock. During times where the door opens before he says their name, Sheldon freaks out and feels the need to knock again anyway. 

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    An exact science?
  • 3

    Sheldon's Catchprase Of 'Bazinga!'

    Photo: CBS / Pinterest

    Due to his inability to understand how cracking a joke works, Sheldon has the tendency to instantly utter "Bazinga!" the moment he thinks he's made an amusing remark. This eventually morphs into becoming his catchphrase and being used almost every time Sheldon's feeling playful or childish.

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    An exact science?
  • 4

    Sheldon's Inability To Understand Sarcasm

    Photo: CBS / Pinterest

    His lack of social skills means Sheldon takes every statement at face value, not realizing when someone's being sarcastic. This reaches the point where he has to ask the person if they're deliberately being sarcastic, and keeping a score of how many times he was able to detect sarcasm.

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    An exact science?