Just did. There's just something mesmerizing about watching action potential jumping from one neuron to the other, and watching blood move. Human body really is amazing.

More to the point - byfnvy, it watching all that stuff helps me to not do it myself. Also, think of all the scars you leave on your beautiful body. Question is - is it worth it? A lifetime of scar memory for a few moments of relief. That is for you to answer