https://www.wired.com/story/patients-are-experimenting-with-ketamine-to-treat-depression/?mbid=nl_62217_p1&CNDID=49046367When used correctly, ketamine is a cheap and effective pain killer. When abused, it can send users into what’s known as a K-hole, an out-of-body experience that’s been described as a kind of mental paralysis.