when I was a kid of about 15 or so, we had our own knockout game we would play - It was (and still is) dangerous, but not as dangerous as the ones that involve choking the kids play now. our version involves no tools or drugs.Ill PM directions but I wont post them publically.
I was "out" for about 30 seconds.
I was on a red glowing rollercoaster in total blackness. at the end of the highest fall, was a glowing red clown's face - as I raced toward it -it became all encompassing, and it enveloped me completely as I passed through.
Then I woke up.
I was about 20 years older, unconscious and in an alley in New York City. I had just been mugged - after a few minutes of adjustment, I realized who I was (different name and I remembered bits and pieces of a totally different life) and that my briefcase was missing. I cleaned myself off, got up, and began to remember the dream I had while unconscious about a rollercoaster, and then it followed I was messing around playing this pass out game with these other kids.
Once I was revived by the other kids by getting slapped repeatedly, they told me that For a few moments I seemed awake, collapsed, and went into all sorts of convulsions, they thought I was doomed as doomed can be. All of this in less than a minute. I figure this was about 1985 or so, And I have never ever forgotten it.