Traditions were still traditions on Earth, even when in the middle of a war. Of course, when October 31 came around, it just seemed natural that people ran around in masks and costumes only somewhat out of the ordinary than what they normally wore. Everyone but a certain boy genius, sitting behind his desk and preparing something he had declared "a surprise for anyone who wanted to be scared".
He was working on a haunted house.
His costume consisted of a bloody lab coat, a pair of cracked goggles over his normal glasses, and muddy boots. There was a fake machete tucked into his back pocket of his black pants, which was also stained with blood and dirt. The ensemble fit him well. He just had to remember to keep his eyes very, very wide to show the extreme whites of his eyes. There was a smudge of blood on his cheek, which he smirked at every time he looked in the mirror. It struck him as funny. People always said he was insane, mad, so why not act it?
His entire haunted house was being constructed by Dexbots, and even a few of them with emotion chips installed decided a few of the things Dexter wanted to include was a bit too much for them to handle, and passed it on to another robot without emotions.
Dexter supervised, Mandy at his side. "So, Mandy, what do you think of it so far?" He narrowed his eyes at a collapsing wall but shrugged it off. He'd just add a swamp next to the ruins. Add to the effect, eh?
Mandy was examining the operation through cold eyes. "Try more hands on experiences. Accidentally separate them, make them feel like their alone, physiological stuff. It'd be mentally unsettling."
Dexter took this into consideration. "Mandy, I now put you in charge of the operation of my haunted house. Make it as scary, horrifying, and 'mentally unsettling' as you can."
An evil look crossed Mandy's face in a flash. "Excellent."
Dexter shivered and headed back to his office, getting the last details down.
Almost all the operatives at that base and several others from farther away bases were coming to see the house. A few of the weaker were turned away from it by the sound of the hysterical screaming coming from the lab, but it also brought more and more people to the challenge.
The first were almost too scared to come in when the first ten that went in came out shivering and pale, eyes wide and frightened like wild animals, but whispering something along the lines of going again like a chant.