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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
    42 VOTES

    The Roommate Agreement

    Photo: CBS / Pinterest

    Sheldon constantly brings up the "Roommate Agreement," a set of documents he considers legally binding over his living situation with Leonard. This makes life difficult for Leonard as he has to put up with ridiculous terms as per the agreement. Examples include Leonard agreeing to meet with Sheldon in the past if he creates a time machine, and not being allowed to whistle in the apartment.

    An exact science?
  • 2
    41 VOTES

    Sheldon Reminding Everyone He's Not Crazy

    Photo: CBS / Pinterest

    Sheldon's neurotic personality leads each character that meets him to assume he's crazy, which he's quick to point out isn't the case because his mother specifically had him tested to make sure.

    An exact science?
  • 3
    72 VOTES

    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. 

    An exact science?
  • 4
    83 VOTES

    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.

    An exact science?