Ponies are far too panicky to get bogges down in McCarthisim. They’d skip straight to paranoia fueled mayhem.

I’d like to know what would happen if Chrysalis’s empire was visited by The Thing. I wonder how that would go down…
 
Oh yeah; with absolute mayhem!

roll out the pyros, it is time to spycheck!

Quick, Call Joseph McCarthy! He’ll know what to do!

@Trickquestion  
CHANGELING CH-  
…  
OH COME ON!

 
did somebody call meeeeeee?

And there is nothing you can do to stop us. Heck, one of us could be Princess Celestia or Princess Luna.

“So, who’s ready to go find these changelings?”  
“Right behind you.”

Tired of not knowing who to trust due to the recent surge of Changeling infiltration? Do you suspect your neighbors, your teacher, and even your own family? Well come on down to The Rapidash Depo, dealer of all fire related products, cause in light of those dirty Changelings, all flamethrowers and flamethrower fuel is now 40% off! Shed some light on your life today!

Guys, I read somewhere on the internet that disguised changelings don’t have genitals.  
EVERYONE DROP YOUR PANTS

The secret to the flame thrower is that changelings immerse themselves in flame when they transform.
 
So if the pony burns to death you know it isn’t a changeling. Now sometimes changelings will scream and writhe around in false pain, just hold the trigger, a pony will die a changeling will not.
 
Beware of 2 things when using this method. 1 Stab the body if it plays dead or it will kill you. 2 Make sure you are not alone when administering a fire test, a 1 on 1 fight with a changeling is bad enough if you are not a mane character, a fight with a changeling that is also on fire is worse.
 
Overall 9/10 Sociopaths agree that a flamethrower test is the best changeling detection test available, the 10th was burned alive, not a changeling BTW.
 
There are other less fun tests like disguise removing spells but if you use that method you are boring and probably a Librarian.
 
This has been a Public Message on Changeling Safety from the Equestria bureau of privatized fire departments in conjunction with Manehatten Arson Enthusiasts.

CHANGELING CHECK!
 
Shots flamethrower at Applejack.

Ninja’d by Lium. Still.

It could be anyone of us.
 
It can be you, it can even be me!

I have decided to surrender and give my love to 17 Fluttershy’s… for starters.
 
Enjoy killing each other gentlecolts. o7

Oh shit I think they got Lium.

They could be you! They could be me! They could even be-

Yay, paranoia! Kill everyone around you just to be safe!
 
Am I doing this right?

I know where this is going…
 
“Changeling check!”  
FWOOOOSH!  
Third degree burns

Here, allow me to diffuse the tension in the room from all this paranoia.
 
_{Seven asses.}