UFO sightings and alien abduction are the absolute bread and butter of popular conspiracy theories. The concept that we are being watched by beings from outer space is completely fascinating, while the idea of them actually coming down and visiting Earth is downright terrifying. Some believe that stories of alien abduction are completely fabricated, products of circumstance, confusion, and lies. Thanks to popular media and some highly publicised flagship cases though, there is a growing worldwide following that considers the existence of alien visitations to be fact. This list takes a look at some of the creepiest abduction tales ever recounted, from classic stories of memory loss and time dilation, to much darker, disturbing encounters. There's no guarantee that every one of these tales is truly the result of extraterrestrial activity, but they're sure to send a shiver down your spine. Please note that a few of these entries do contain some content of a sexual nature, so read ahead at your own discretion.