The Hide of Some People!

“We’ve been invaded!!” my younger brother shouted, racing around in circles like he was chasing an imaginary tail. “Aliens are arriving and taking over people’s bodies!”
Poor misguided fellow. Everyone knows that aliens aren’t real.
“Why would they do that?” I asked, trying to placate him.
“World domination! We’re all going to die!”
He must have heard one of those crackpot conspiracy theories.
“That’s not true. People would notice if their family was replaced by aliens.”
At that moment our mother arrived home. She’d fix this; our mother doesn’t like hysterical behaviour, especially not over nonsense like this.
“Mum!!!!!” he screamed. “Earth is being attacked! There are aliens inside people’s bodies!”
I waited for the inevitable exasperated outburst to set him straight, but it didn’t come.
“Oh, didn’t you know, dear?” she said, ripping off her skin to reveal a repulsive green extra-terrestrial hide.