1. Lay down and take 30-50 deep breaths. Make them REALLY deep breaths, so that by the end you feel throughly oxygenated.
2. Stand up, hold your breath, and hold your nose in case you subconsiously breath trhough it.
One of two things will happen:
a. you will feel like you are whatever that drug is that they give you at the hospital that kills pain and makes you feel like you is teh floating (cocaine? :\)
b. you will pass out.
No, it doesn't hurt, but feels cool.
This next one hurts like hell:
Lock your pinkies together and pull apart. No problem eh? Now bite down pretty hard (hard enough so that it hurts, but not too hard so that you can't hold it there) for about 30 seconds.
Now lock your pinkies and pull apart. Ouchies

Might post more later.