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Only the Knowledgable May Pass
Perhaps you know the truth of how the city fell, three centuries ago. Perhaps you know the secret ritual of White Magic — or Black Magic. Perhaps you know the way through the labyrinth. Perhaps you know Things Man Was Not Meant to Know. Perhaps you just know the secret handshake, or that The Password Is Always Swordfish. But if you can prove it, any of these are proof that you should be taken seriously: you are in the in-group, of those who know this esoteric knowledge.

Then, this can mean they want to be rid of you, or exploit you, and there is the little matter of figuring out who would understand if you say it. Heaven help you if you accidentally learned it; you will find yourself knee-deep in trouble before you can blink.

In The Infiltration, it is a frequent point of failure — but if you do have the knowledge, it lets you in entirely. The Ancient Tradition, Ancient Conspiracy, and Ancient Order of Protectors take it very seriously.

Unlike Only Smart People May Pass, you can not figure this one out from the clues; you have to have learned it. (Occasionally, the Genius can manage to figure it out, but it will always take him serious time and effort, and it's not always possible even for him.) This is, if they did it right. Sometimes they were clumsy. Conversely, an Only Smart People May Pass riddle may turn into this if the answer is too insane or difficult.

Compare Trust Password, Only the Worthy May Pass, Only the Pure of Heart.

Examples

Fan Fic
  • In Winter War, while meeting in an occupied city, Soi Fong and one of her Onmitsukidou use lines from a Tang Chinese poem as a password, switching off in the middle of lines and then skipping to the end. While someone sufficiently learned might know the poem, they probably wouldn't know when to switch off, or recognize what was going on based on the first phrase.
    Kage: After battle...
    Soi Fong: Many new ghosts cry. The solitary old man...
    Kage: ...worries and grieves. (Pause) To many places, communication is lost. I sit straight at my desk but cannot read my books for grief.

Film
  • In Frankenstein: The College Years, Doctor Lipzigger's computer security demands, in addition to a keycard he bequeathed to the protagonists, the answers to two questions: One about chemistry, the other about Star Trek. It was meant so that only the protagonists may unlock it.
  • In Tangled, the guard captain is tweaked with demands for a password during the rescue.
  • In Airheads, Chazz confronts Chris Moore, who claims he's a music executive, but Chazz thinks he's really a cop, so he asks him "Whose side did you take in the Van Halen/Roth split, Van Halen or Roth?" When Moore answers "Van Halen", he's immediately accused of being a cop, but he asks for another chance. So Chazz asks "Who would win a wrestling match, Lemmy or God?" Moore initially answers "Lemmy", but when Chazz imitates a buzzer, he changes his answer to "God", before Rex yells "Wrong, dickhead, trick question, Lemmy is God!", and Moore is forced out.
  • In Back to the Future: Part II, the old Biff Tannen of 2015 gains the trust of the young Biff of 1955 by starting his car in a way only he knows about.

Literature
  • In Guards! Guards!, The Elucidated Brethren of the Ebon Night have a long string of passwords (as does every other secret society in the area, oddly enough at least some of them have the same ones, meaning they have to help each other's members to the right meeting place).
  • Dune: Lady Jessica is able to gain acceptance among the Fremen by using phrases planted in their culture by the Missionaria Protectiva (which manipulates religious beliefs to benefit the Bene Gesserit).
  • In Harry Potter, students in Hogwarts need a password to enter their dormitories. (With the exception of the students in Ravenclaw, who use a riddle — Only Smart People May Pass.)
    • Fridge Logic: What's stopping a Gryffindor or Slytherin who can figure the riddle out from getting into Ravenclaw dorms when they shouldn't?
      • Basic courtesy? It's a dorm, not a bank vault. Besides, its actually pretty tricky to find the entrance to any given dorm in the first place if you don't already know.
      • The fact that they don't know to try? It isn't common knowledge that Ravenclaw doesn't require a password.
      • Perhaps Ravenclaws don't mind if smart people from other houses want to get in to their dorm.
      • Anyone with the mindset to solve the riddle is probably a Ravenclaw already.
      • There are also some indications the original founders didn't want the school as "house divided" as it turned out to be. They probably wouldn't have minded if students from other Houses came over.
  • Doubly subverted in Septimus Heap, since while the DoorKeeper of the House of Foryx doesn't allow Jenna and Beetle to enter even after they have resolved the puzzle that is The Right of The Riddle, they eventually get into the house with violence.
  • The Kaiel Death Rite, in Courtship Rite, which is applied to heretics, consists of seven increasingly difficult deadly tests. Each test must be designed so that someone who is familiar with "the common wisdom" can pass, because it is the common wisdom that is threatened by heresy. When the protagonists are ordered to marry Oelita, the Gentle Heretic, they decide to use the Death Rite to test her fitness to wed them.
  • In Rick Riordan's The Heroes of Olympus novel The Mark Of Athena, the ghosts of Mithritic initiates think they have this. Annabeth does indeed have some of their secret knowledge, but bluffs through the rest, notably added by her ability to make guesses based on the room's decor.
  • In Dan Abnett's Ravenor vs. Eisenhorn novel Pariah, Lupan tries to make a veiled approach to Beta. Unfortunately for him, the code terms he used were so ineptly woven in as to signal that something was wrong to her.
  • Inverted in Illuminatus!. Robert Drake spends a considerable amount of time and effort trying to force his way into The Illuminati by demonstrating his knowledge of the Ancient Conspiracy.

Live-Action TV
  • In Doctor Who, when the Doctor meets up with the amnesiac Brigadier, teaching at a boys' school, the Brigadier's attitude undergoes an abrupt change when the Doctor mentions UNIT — he still doesn't know him, but anyone with sufficient secret clearance to mention it ought to know better than to talk like that.
  • On No Ordinary Family JJ proves he belongs in the Smart People's Club by citing its latitude & longitudinal coordinates.
  • Pops up repeatedly in the last two seasons of Stargate SG-1. In order to access the ancient treasure in "Avalon", one must possess "wealth of knowledge and truth of spirit." Similarly, "wisdom" is one of the virtues required to find the Sangraal in the season 10 two-parter "The Quest." In both cases, the protagonists are required to not only solve puzzles and riddles, but also have prior knowledge of Ancient language and culture (and the King Arthur mythos.)

Tabletop Games
  • Call of Cthulhu. In several published adventures, using your Cthulhu Mythos knowledge when speaking to cultists allows you to pass yourself off as one of them, which can considerably increase your life expectancy.

Webcomics

Western Animation
  • In the Futurama episode "Fear of of Bot Planet", two characters in disguise must prove they are robots by passing such a test:
    Robot #1: Administer the test.
    Robot #2: Which of the following would you most prefer? A: a puppy, B: a pretty flower from your sweety, or C: a large properly formatted data file?
    Robot #1: Choose! (Leela and Fry whisper)
    Fry: Uh, is the puppy mechanical in any way?
    Robot #2: No! It is the bad kind of puppy.
    Leela: Then we'll go with that data file!
    Robot #2: Correct.
    Robot #1: The flower would also have been acceptable.
    Robot #2: You may pass.

Real Life
  • In medieval times, masons needed a way to know whether other masons really knew their stuff, since they traveled a long way on jobs, failures of skill could be disastrous, and it was really hard to check with those who taught them. Their solution was secret rituals — only a skillful mason would be taught them, so knowledge proved his skill. (The true origin of the Freemasons.)
  • To anyone who has ever forgotten a code or password to access an account, this trope applies. Painfully.
    • This Cracked article describes how easy it is if you know enough about someone, to infiltrate their email and facebook accounts by guessing their security questions.

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