Anyone ever get oxygen deprivation while standing up?

Happened to me a few times when I first started.
SCARY shit.
Wake up with my knees bent, fighting for control of my body/limbs.
Everything shaking, fighting AS HARD AS I CAN to control my hands/bong, but I end up getting shit everywhere...

Couple times it's been pleasurable though. Taking a big grav bong.... and it's like stretching towards the darkness... and you get to a point of no-return...
Inferius Reviewed by Inferius on . Black out So I was standing outside smoking a blunt last night with my bro and after a few hits everything started to go dark, my vision was totally leaving me, then my hearing went, I could barely hear anything, and then it was lights out. I woke up right after I hit the ground to my brother saying something I couldn't understand. I felt fine after a sat down and smoked a cigarette. This ever happen to any of you? Rating: 5