While whatever you heard bump in the night was probably nothing to be concerned about, if you see a suspicious blob of clothing on the floor, you might give it another look. Although not particularly dangerous, YouTuber “Sciencish” has come up with a robot that causes a pile of clothes to turn and face, then travel towards the light source you used to check it out.

The device features four photoresistors, along with an Arduino Uno and two steppers on a robotic chassis for movement. It also accommodates a filament or wire frame on which clothing can rest. When a light is shined at it, the LDRs pick up this “signal” through the clothes. The robot then waits until the lights are off, pauses a bit more, and then rotates to face the person and incrementally advances.

It’s a terrifying idea, and something that could be implemented in many forms, such as the Minecraft spider disguise Sciencish made for it out of cardboard — perfect for some Halloween fun!