UPDATED(2/13)This is possibly the most disturbing thing I've seen on the Interweb. I'm sorry for inflicting this upon all of you.
PUBLIC SERVICE ANNOUNCEMENT: Always consult a mushroom field guide before consuming wild mushrooms. Eating random wild mushrooms may result in various side effects, including DEATH.
The mushroom featured in this video is Amanita Muscaria, a psychedelic but otherwise non-deadly mushroom (it might, however, make you nauseous). Thanks to the hundreds of mushroom experts that have commented. I am in your debt.
After a rigorous session of super-sleuthing, I was able to find out more about this guy. It seems that he is a performance artist from Japan that goes by the name of 'wotaken.' Here's his home page: http://katura.is.land.to/index.html