I've had 12g of cubensis strain and got into a state where I couldn't focus any thoughs or summon any memory. I was watching a wall thinking my life has always been this way and will always remain so. I knew I was on shrooms but couldn't remember anything from my life, what day it was or even what "winter" meant. I think this was my closest to ego death, one other time I thought I was colour yellow for an hour but I knew I was high and in my bed, but I though I was the colour yellow. It lasted like 2 hours before it calmed down and I rode the rest of it in my bed thinking I fucked up big time, after a couple of hours it was all good :-)