Creepypastas are generally like this :

• protagonist Find, get gifted or buy cursed thing
• cursed thing is tied to some kind of evil entity.
• the evil entity is a regular mascot, an "original" one as in "random object" head or unique like slander man and it's countless copycats "random adjective" man. Entity have red, black eyes and/or blood coming everywhere.
• evil entity tease the new owner and does evil things
• owner try to remove the curse by throwing the object but it mysteriously come back
• bad ending.