Trust Password: Difference between revisions

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[[Crazy Prepared]] characters naturally have at least one of these.
 
Not to be confused with [[Safe Word]]. Really.
 
{{examples}}
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* ''[[Winter War]]'': How do you convince someone who's been [[Master of Illusion|Aizen's]] prisoner for ''months'' that you really are you? {{spoiler|You hand him his [[Empathic Weapon|zanpakutou]]- which will do the convincing for you.}}
* [http://www.accessdenied-rms.net/forums/showthread.php?tid=6210&pid=87548#pid87548 An abandoned passage] from ''[[Drunkard's Walk]]'' includes an example of this trope that's also a [[Shout-Out]] to ''[[Back to the Future]]''.
* In the ''[[Harry Potter]]'' fic ''[https://archiveofourown.org/works/23702959/chapters/56911591 That Universe Over There]'' by "mytimeconsumingsidehobby", Harry and his younger, [[Gender Flip]]ped dimensional counterpart Ivy have a Trust Password between them, "sweetie", which gets used at least twice over the extant course of the story:
{{quote|“Okay, I’m just going to cast a couple spells on you sweetie. Nothing bad, just need to check a few things.”
Ivy, recognizing their code word for I-need-you-to-trust-me-and-just-go-with-this, nodded and walked the rest of the way over to where Harry stood...}}
:The phrasing here implies there might be others, but they haven't appeared in the story yet.
 
 
== [[Film]] ==
* ''[[Bill and TedsTed (film)|Bill and Ted's Excellent Adventure]]'' (see page quote) has the future selves prove that they are who they are by identifying what number the present selves are thinking of.
** Given their personalities, it's not ''that'' hard to guess...
** Turned on its head in ''[[Bill and Teds Bogus Journey]]'' when the "Evil Robot Usses" correctly guess how many fingers Ted is going to show them; it's entirely possible he only held up the amount they said because they said it.
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* In ''[[Mara Daughter of the Nile]]'': Sheftu gives Nekonkh a Trust Password for Mara: "Tell her I have not forgotten what I said last night when I took her in my arms." Nekonkh is repulsed by Sheftu's cold-bloodedness, as he is to use the Trust Password as part of Mara's [[Feed the Mole|loyalty test]].
* Played with in [[The Hourglass Door]] trilogy (As it's full of time travel). In the second book, Leo tells V to go back in time and tell his past self that, "the lady of light" sent him, and that it is time, "to honor his vow," so that Past Leo won't kill Future V. In the third book, main character Abby goes back in time and saves Leo, who calls her his lady of light, and she asks him to promise to do something for the one who asks him to honor the vow. It gets more confusing from there.
* In ''[[Discworld/The Science of Discworld|The Science of Discworld]] II'' after traveling back in time most of the wizards make a point of saying something to their past selves to prove that they are time travelers rather than doubles created by the elves. The exception is Rincewind, who is so jaded by everything that's happened to him in his very eventful life that he just walks up to his past self and says hi.
* In [[H. Beam Piper]]'s ''[[Four-Day Planet]]'', there's a moment when the narrator remarks that if, when his father dies, a medium claims to produce a spirit message from him, he won't accept it as genuine without Dad's [[Catch Phrase]], "Now wait a minute; it's here somewhere." This isn't any kind of [[Foreshadowing]], just a bit of humor about his father's way of misplacing things and rummaging around looking for them.
 
 
== [[Live -Action TV]] ==
* In [[Battlestar Galactica (1978 TV series)|the classic ''[[Battlestar Galactica Classic]]'']] series, when Starbuck escapes from the Cylons by stealing one of their ships, he proves it is him to the ''Galactica'' by "waggling" the ship back and forth (since the ID transmitter he was given was damaged).
* In the Series Four ''[[Doctor Who]]'' episode "Forest of the Dead," Professor Song {{spoiler|whispers the Doctor's name into his ear}} to prove that she knows him in the future.
** Subverted in later episodes where it is implied that that she might not be someone he ought to trust after all.
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== [[TruthReal in TelevisionLife]] ==
* According to tradition, [[Joan of Arc]] whispered some secret to the Dauphin to convince him that she had really been divinely inspired to help him claim the throne. According to additional tradition, what she whispers is that God wants him to be king of France, though some prefer to believe that she described an embarrassing birthmark on his backside.
* Magician [[Harry Houdini]] had spent much of his later career debunking mediums and others who claimed to speak "from beyond the grave". He arranged a number of code phrases (one being a song called "Rosabelle") as identifiers for his wife Bess if such communication was possible. He died in 1926, well before Bess. No one was ever able to deliver a message she was satisfied was genuine.
** [[Take That|Funny how "paranormal experts" never bring that up.]]
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* Careful parents often arrange these with their children, so that the children can verify that anyone who claims to be sent by mom and dad actually was (as in the [[Bones]] example above). Some PSAs (or similar productions) recommend this if the family ever gets separated.
* Surprisingly more common than most people think. It's extremely easy to set up, and it never hurts to be [[Crazy Prepared]] or [[Genre Savvy]].
*** There was a website many years ago (it's long since dead) that was touted as a "time-traveler's support network." Meeting places and times in various cities were designated where a "volunteer" from the project would wait for someone to say a one-time use passphrase and render aid. The database of locations, times, and phrases was said to exist in a sealed document held by a law firm which would be turned over to any time-travel project in the future.
*** It may be long since dead now, but if you're going back in time that shouldn't really be a problem.
* As in the ''Bourne'' example above, secret agents normally have security checks they can insert into a message to verify that it's real. During [[World War II]], one British agent captured by the Germans deliberately gave his captors the wrong security check. He expected his bosses to realize that the messages coming from his radio were false. [[What an Idiot!|His bosses didn't pay attention.]] ''Das Englandspiel'' (also called Operation North Pole) resulted in the capture and execution of approximately fifty Allied agents, and didn't end until the Germans themselves called it off in a clear-text message to London..
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[[Category:Time Travel Tropes]]
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