Horror movies have the power to scare the pants off of us. Whether they’re ghost stories, creature features, or tales of real-world terror, the genre is consistently able to capture an audience’s attention like few others. And horror directors love to push boundaries — to find new ways to freak and gross us out. But whether it was due to violence, gore, or suggestive content, the horror movies that have caused the biggest uproar have often gone on to become classics in the genre. Here are five horror films that caused major controversy when they first hit theaters.