In 1987 in Wyoming, a hacker managed to interrupt broadcasts from a local programming channel and aired his/her own video. The video that we propose you to watch contained numerous clips of disembodied, human heads showing various emotions and тАЬposesтАЭ. Many people, having watched this video, started to complain on vomiting, hallucinations, headaches, etc. The most important, people had experienced fear watching this clip. They had an impression that there was somebody standing behind their back. However, specialists have determined that the cause of these afflictions were frequencies played regularly throughout the broadcast. In this clip, the frequency being played is somewhere between 17 and 19 hz. This range of frequency, when played for long periods of time, causes the eyes to subtly vibrate, sometimes inducing visual hallucinations. Son if you like strong emotions and adrenaline, this video is for you.