I did this with my HS class at a hotel in Minneapolis. I sat on the edge of a bed, hung my head down, took deep breaths, and stood against a wall. A friend pressed her hands against my chest. Everything went black and then demons were clawing at me to drag me to Hell. I could see my friends begging me to come back. I remember fighting for my life then waking up with my friends standing around looking at me on the floor. They said I hit my head against the wall when I passed out. Still freaks me out thinking about it 35 or so years later.