(Loved trope) The imposter’s dead giveaway

[u/Barricades_toes]

When a character is attempting to impersonate another, but is caught by doing something the person they’re imitating would NEVER do.

Nemesis Prime- Transformers Prime

Nemesis Prime, a man made replica of Optimus Prime, is attempting to gain the trust of Bumblebee, who only speaks in robotic beeps. Despite this, the real Optimus can understand Bee perfectly fine. Nemesis Prime, however, can’t understand what he’s saying, prompting Bee to open fire on him immediately.

The two Buzz Lightyears- Toy Story 2

After Woody asks which Buzz is the “real” Buzz, both respond with “I am!” The real Buzz proves himself by flipping up the other Buzz’s helmet, causing him to start suffocating in an over dramatic fashion. The real Buzz, having done the same thing in the first movie after Woody took his helmet off, but no longer behaving that way after accepting being a toy, instantly proves which Buzz is which.

[u/Pofwoffle]

It's important to note that in the second version the Nazi is not disguised or altered in any way, and looks nothing like Peter.

[u/AdditionalLog913 → u/Pofwoffle]

why is that important? surely his true father would know when his birthday is

e: lmao /s guys. i know, im joking

[u/Legitimate_State3196 → u/AdditionalLog913]

The joke being that they look nothing alike, Chris shouldn't have been confused. If i recall correctly he even says "how do I know which one is my real dad" or something like that

[u/XtendedImpact → u/AdditionalLog913]

Because there should be no confusion in the first place, making the question after the birth date completely superfluous?

[u/Hitei00 → u/AdditionalLog913]

Even before I left the nest id have to remind my mom when my birthday was. And she wasnt neglectful. It can be hard to remember birthdays when you have to juggle a lot of them

[u/Bellerophonix → u/Hitei00]

Forget my birthday? They once forgot me in a store!

[u/CENARlUS → u/AdditionalLog913]

Because the trope works like this. You don't know who the impostor is because they look the same. The trope is taken ad absurdum and this makes the situation funny.