Oh this dude. On Nico Nico, he has an entire series of himself eating crap that you wouldn't normally eat unless you're retarded.
I've seen him eating month old eggs, wild mushrooms, milkshakes composed of McDonald burgers... he even tried attempting making a "high potion" by mixing thousands of yen worth in energy drinks and tonics. Most of the time, he gags on his concoctions and pukes them out.
He's pretty popular... every video he has has a few hundred thousand views.