10 Horror Movies Inspired By Creepy Urban Legends

10. Giant Alligators Live In The Sewer System - Alligator

You've all heard that story of rogue reptiles growing unfathomably large in the sewers. They're bought as little tank pets before growing uncomfortably big in unprepared owners homes, and end up making a swift exit down the nearest toilet rather than releasing them back into the wild. There, they feast on all your dirty doings and dumped goldfish for years, until they grow to unchecked, monstrous proportions to attack sewer workers and take over the underground.

Sometimes, they even become mutated from the toxic nature of sewage systems and incorrectly disposed of waste - which is exactly where 80s monster movie Alligator gets its titular beastie from. Chomping down on discarded corpses of animal test subjects imbued with a growth formula, the alligator grows to ridiculous proportions, and quickly moves onto humans for its main course.

Alligators in sewers aren't unheard of, but gigantic, irradiated behemoths rampaging through the pipes would probably get better coverage than one campy B-movie from the 80s. As scary as the thought of prehistoric monsters out for flesh is whilst you're sitting on the porcelain throne, you're probably safe on this one. Or so you'd hope...