I've blacked out before, both times were under different circumstances tho. The time that it was totally weed related, involved a two foot bong and inhaling as much as I could, then my friend put me in a sleeper hold and threw me on the couch, I ended up in a world of floating red arms as the walls arround me, then I woke up to this chick staring at me and tons of smoke billowing from my mouth. Thats all I remember from that day.....
The other instance involved smoking while crouching, then getting up too fast. I got up to load another bowl, but didnt feel right so I put my pipe down, next thing I knew I lost control of my body and started running into the wall of my friends room (almost broke his full length mirror with my head lol) Never had anything happen like that since, still hilarious imo