Of all conspiracy theories with first-hand accounts given to authorities, alien abductions and UFO sightings have to be the most common. The idea that the human race is being watched by aliens from outer space is fascinating, and the concept of these creatures flying down and visiting our humble planet is outright terrifying. The most common theory is that every story of alien abduction is a complete fabrication, or products of confusion and misconception. However, because of the impact of popular media and some highly publicised cases, there is an ever-growing following that considers the reality of alien visitations on our planet to be completely true. This list takes a look at some of the most bizarre accounts of alien abduction ever, from dark tales of weird medical examinations, to disturbing encounters with malevolent beings. We can't vouch for the truthfulness behind each claim, but every entry here is sure to send a shiver down your spine. Please note that a few of these entries contain some disturbing or sexual content, so proceed with caution...