Spooky Shit

You best not mest with Spooky Shit.

Something that's mysterious and has odd side effects, usually magical or magic-like, that no one should mess around with seeing how they don't know how it functions. The Spooky Shit might come in the form of a potion or strange substance. The phrase also refers to something that's actually spooky or at least intended to be. Spooky Shit also has the power to make anyone uncomfortable and want to leave the area.