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No One Else Is That Dumb
Yugo and Aki: Who are you?
Keiji: It's me, Tokiwa, yo!
Yugo: What's 1+1?
Keiji: 3!
Yugo: It really is Tokiwa!

In some cases where the party has been split or someone has changed so much you hardly recognize him or her, you may want to make sure the Bob in front of you is the person you know, and make some kind of check; for example by asking him something only the real Bob could know. But what to do when Bob is usually so stupid he doesn't really know much? Well, you will check just that instead. Ask a question expecting an answer so silly that only the real Bob would be capable of pulling it off. Of course, Bob may also show his idiocy without waiting for any question. Inversely, giving an unusually intelligent answer will reveal the imposter.

Compare Trust Password and Bluff The Imposter. Will often overlap with Spot the Imposter.

Sub-Trope of Something Only They Would Say. See also Who Would Be Stupid Enough.

Examples:

Anime & Manga
  • The above quote from Silver Spoon is after Keiji made a dubious relooking during his summer vacation.
  • In the early volumes of Naruto, anticipating a separation and knowing they are eavesdropped, Sasuke deliberately makes up a long, complicated password as a check. When Naruto comes back after they split up, he says the password flawlessly... which identifies him as an impostor since the real Naruto would have forgotten such a long phrase immediately.
  • In Tantei Opera Milky Holmes, Queen Claris attempts to prove to Milky Holmes and G4 that she's actually someone else disguised as Sherlock by telling them a Mouthful of Pi. However, it turns out that she only has to say "3.14", before they're completely convinced that the person in front of them is way too smart to be Sherlock.

Comic Books
  • When the Stephanie Brown Batgirl's Friend on the Force gets in the middle of a fight between Batgirl and Clayface in Batgirl's shape, one of them says to shoot her, because she'll bleed and that will prove who she is. He shoots the other one, because only the real Steph could possibly think that was a a plan.

Live-Action TV
  • Blackadder II: the Master of Disguise Prince Ludwig has infiltrated the court of Queen Elizabeth; the palace is having a fancy dress party to take her mind off her troubles and Blackadder (who was Ludwig's prisoner) told Ludwig that Nursie always dresses as a cow. Then Blackadder escapes, returns to London, and stabs Nursie while she's dressed as a cow - but it isn't Nursie, it's Prince Ludwig.
    Edmund: This was the information with which we bought our lives. We told him that, if the Queen was having a party, Nursie always goes as a cow. From that moment, he was doomed. All we had to do was escape, return, and kill the cow.
    Queen: How could you be sure it was not Nursie?
    Edmund: Because, My Lady, Ludwig was a master of disguise, whereas Nursie is a sad, insane old woman with an udder fixation. All we had to do was kill the one that looked like a cow. That was the mistake I knew that Ludwig would make. His disguise was too good.
  • Red Dwarf: When a Psiren is impersonating Lister, the other characters ask one of the two indistinguishable Listers to prove he is the real one by playing the guitar. The first Lister does so, very well, and the other characters shoot him. They know the second Lister is the real one because he only thinks he can play.
  • On the Israeli sitcom Shemesh, the stereotypical Dumb Blonde Ogen is revealed to be a spy, after a few characters notice they have no idea what her source of income is. She tries to go into HQ, where she is asked for the password, and she answers, ‘...Can I get a hint?’ She gets in, where she’s told she’s fired and can drop the ditzy act, but she has no clue what they’re talking about. (Then again, this show has had a lot of Negative Continuity, including Ogen’s Backstory, which makes this a somewhat weird example.)

Web Comics
  • xkcd heads towards some sort of Trust Password, but short-circuits it in favor of "no one else is that nerdy."
  • Sluggy Freelance:
    • In "It's the Wrong Torg, Grommit!" the protagonists have some issues with random dimensional travel, especially when parallel dimensions with parallel events start interacting. At the end, Riff and Zoë have to wonder whether the Torg who shows up through a dimensional portal is really their version of him. At first they think it's not, because he goes to Bun-bun and asks for a hug. Then they realise it is, because he was using it as a test as to whether he was in the right dimension (only his Bun-bun would react so violently) — and only their Torg would be dumb enough to use that as a test.
    • In "Kesandru's Well":
    Torg: I was wrong. This house is not a ghost trap! It is an elevator to hell with ghosts in the gas tank.
    Riff: Elevators don't use gas tanks.
    Torg: Right... bad analogy. How about... It's an inverted toaster popping the bread of us on to the "two eggs up, and a side of bacon" plate of hell! With ghosts in the gas tank!!
    Riff: Well, we know Torg's not possessed. That's Torg all right.

Western Animation
  • There was an episode of Bananaman where the protagonist was distinguished from his fabricated clone that way.
  • The episode of Family Guy where Brian has to distinguish between the real Stewie and his evil clone - both are naked and there are no other clues. Brian eventually hits on the fact that the real Stewie will revert to type and behave not as a world-dominating evil genius but as an eighteen-month old toddler. He asks both to look at their feet. The evil clone sneers while the real Stewie is captivated by his own wiggling toes. Brian then knows which one to shoot.
  • In an episode of Goof Troop, Goofy encounters a criminal who looks just like him. In order to tell them apart, Max sets down a bucket of wallpaper paste and asks his real dad to please step forward. Max immediately knows that the one who clumsily steps in the bucket is Goofy.
  • In an episode of Inspector Gadget, a criminal Master of Disguise infiltrates an important police meeting as Gadget himself. When the real one shows up, he accidentally knocks down chief Quimby with his mallet, prompting Quimby to order the other one arrested.
  • In an episode of Action League Now, the Mayor creates an evil robot duplicate of The Flesh. Since the other Action Leaguers are somehow unable to recognize the real Flesh as the one who doesn't have bolts sticking out of him, Stinky Diver manages to identify the real Flesh as the one who responds to his shout of "Hey, stupid!"
  • On The Simpsons When Bart impersonates a shelbyvillian, he is questioned by the other kids.
    Shelbyville kid: How come we haven't seen you in school?
    Bart: I don't go to school.
    Shelbyville kid: Oh yeah? What's 2 plus 2?
    Bart: 5.
    Shelbyville kid: Story checks out.
  • In SpongeBob SquarePants when Sandy questions whether SpongeBob and Patrick were really them and not a snail she asks Spongebobs mom's maiden name and Patrick his first name.
    Patrick: Uh, is this a trick question?
  • A Winnie the Pooh film had this. Piglet was trying to confirm that it was, in fact, Pooh. He suggested Pooh say something like, "I am Pooh." Pooh, naturally, said, "Really? Well, then, who am I?" Piglet chuckled and said, "It's Pooh."

The NondescriptRecognition TropesPaper-Thin Disguise
No Means YesDialogueNon-Answer
Noble Space SavagePages Needing WicksNo, Really, It's Okay
No More for MeComedy TropesNon Sequitur Distraction

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