A water balloon with a glow stick on the inside, in a stocking, hung from trees, patio cover, or the ceiling. Same pin elsewhere said: "Put a glow ball in a white stocking and hang many from trees or the ceiling." But what are glow balls?
"Break off in case of sparkly vampires" - I think this would be even more effective without the "Sparkly" part. But In all seriousness this sign is racist against vampires. A hate sign is what this is!