Kaitra_Moralevi
An AU where Horror!Sans is a haunted animatronic, or rather android with technology so advanced that the people of his time were convinced he was made with magic. He's a lone wolf who scares and haunts all those who enter his diner, as per his entertainment programming. However, one day when his safety protocols bug out and he can't stop, he accidentally kills numerous people in the diner. That diner was immediately shut down, but they couldn't shut the animatronic down, it being too dangerous to approach without injury. It was locked in the basement of the establishment, left to rot.
After 30 years, Huxley, our spookie android, managed to hit his head weird.