I was trying this I guess when I was away just recently... You know how you lay down, and get up fast, your vision goes black, and you feel weak and it's hard to stand? I had this bag of chips I had bought...and after I finished them off, I had put it over my mouth, and breathed in and out. Lack of oxygen...well, I needed to get up after doing this after a little while, and I fell down almost instantly as I got up. I believe self harm is only self harm if the action is with intent to harm yourself for reasons that you're conscious of. But this, what I'm asking, is if this is a method anyone's ever heard of. I guess I thought about it...if you do this, you can really get hurt. Anyone?