I don't get whats so wrong about enjoying physical pain. Pain is an emotional impulse, just like happiness. It's how you think of it that matters. I happen to find it relaxing.
And yes, the staples in arm trick works perfectly. I shot 2 or so in the middle of my english class. People were offering to pay me to do it again. lol. The girls on the other hand offered to pay me not to do it...