Killer: Wear all black: socks, shoes, pants, gloves, and shirt so no skin is showing. Then buy a mask that is a ghost face or get one that is from the motion picture of Scary Movie. This costume won me scariest costume this Halloween. Thanks to Lani (11)from Missouri for this scary idea!! Ghost Face- With Blood & Pump The Ghost Face as seen in the movie Scream, with a little more.