Sorry in advance for the nightmares. Recently, Reddit user u/MythicalMicrowave asked the question: " What’s the scariest horror movie you’ve ever watched? " Here are some of the most top-voted responses: Event Horizon (1997) The Descent (2005) The Wicker Man (1973) Sinister (2012) The Grudge (2004) Paranormal Activity (2007) Hereditary (2018) The Fourth Kind (2009) Poltergeist (1982) Fire In the Sky (1993) The Strangers (2008) Signs (2002) The Ritual (2017) It Follows (2014) Midsommar (2019)