He hadn't meant for it to turn out that way. He had just wanted to stop people from coming to Freddy's. He would put on the costume, take some kids back to the employees only room, and scare them. And it worked, though people complained, no one knew it was him. After all, he was the day guard, and they would always ask him if something strange happened.
He put the costume on while no one was looking, and peeked out of the room. A group of kids were sitting at a table, laughing. They must have been gradeschoolers, from their size. He counted how many of them there were. 5 children. 5 children that will never come back to this pizzeria, he thought. He came up to the table. The children looked up at him as his shadow fell upon them.
"Hey kiddos, are you having a good time at my pizzeria?" he asked, putting on a Freddy Fazbear-like voice.
"We know that's a costume, mister." one of the children said. "We figured that out a while ago."
"Oh, would you like to come and see the real Freddy, then?" the man asked.
"But Freddy is right there." the child said, pointing at one of the plastic animatronics on the stage, who were singing a happy tune.
"That's our other Freddy," he laughed. "Freddy doesn't like to come out during the day anymore. But I can convince him to meet you, if you'd like."
"Really?!"
"Really."
So he took them back to the room, where the old animatronics stay. He let the room stay dark, until all the children were inside. Then he closed the door and locked it. "Where is he?" a child asked.
"He's right in front of you." the man answered, and turned the lights on.
The lights revealed the hideous remains of 4 animatronics. Bonnie, Chica, Foxy, and, of course, Freddy. The children stared at them, wide eyed. The man picked up the knife he placed within the room beforehand, and walked slowly behind the children, to the last one and back to the first. "Oopsies, I forgot." the man grinned from under the costume. "You can't tell anyone about Freddy. He wouldn't like people to know how... unbecoming he looks." He brandished the knife to the children, making them think he would use it.
He hadn't been planning on such a thing, until one of the children began to scream. The room was soundproofed, he had planned for it. He came up to the child. The child began to cry. "Don't kill us, please! Somebody, somebody help us!"
"Shut it, kid, no one can hear you." the man began to say, when another one of the children jumped onto him, grabbing at his mask. He swore, and tossed the child off him. But the child had taken the mask along with him, to the ground. All the children could now see his face. They could tell their parents, and he could be arrested. He broke out swearing, then noticed the child had dropped the mask and headed to the door.
But the door was locked. The kid began screaming. "Freddy! Freddy, please save us!" the child cried. But the man was right behind him. He grabbed the child's shoulder.
"Turn around, I want to see your face." the man ordered. The child trembled as he turned to face the man.
"I'm sorry, we won't tell anyone." the child stuttered.
"I can't trust your word. You're a child, you don't know how bad a lie can be." the man said, and put the knife into the child's chest. It only took that to kill him, the knife puncturing the small boy's lung.
With that, there was no turning back. He looked at the other 4 children, trembling in a corner. Then he looked at the 4 animatronics, standing there, in shambles. A horrible idea came into his mind.
After he had finished with the dispatching of the 4 children, he looked at the body of the young boy on the floor. There was no 5th animatronic to hide the body inside. He found a sheet, wrapped the boy up, and secretly took him out to the back of the building. That was where he burned the body, the sounds of the other children screaming as he forced them into the animatronic suits echoing through his mind.