Damn. Luckily I don't recal ever blacking out on any substance... just one sober time when my friend taught me a breathing "technique" then pushed my chest into the wall. I was out for a good 60 seconds, but I hadn't even realized I blacked out. Man that breathing/chest-pushing was cool/weird, but I don't think I'll be trying it again (I was like 13 years old or something, kids are pretty stupid).