We live with more than a few cartoonish dangers in our world. There's loose monkeys, plants that only exist to inflict pain, and brain amoebas. There are cliffs, falling rocks, and every manner of potential electrocution. If not for these creepy signs that make their message clear, we'd be having that much harder a time. While terrifying signs are first and foremost helpful things, that doesn't mean they're not real spooky.