belly button piercings

my buddy is BIG into body mod... he did that crap where you hang on hooks.... he was telling me about (the exact name escapes me but it's funny sounding) people who drill holes in there skull.. it supposedly relieve pressure and makes you "think differently" kinda like after you take acid allegedly. Mind expanding if you will..

Hooks? Like in that movie The Cell?

I can't remember what the hole thing is called either. But I remember hearing about it. They say it increases the flow of oxygen in your blood to your brain. This supposedly can "enlighten" you.