I useually cut when my emotions run high. It's sort of a release, I stop thinkig straight, when I do it it clears my head and I focus. I seem to get control, but I really don't which is frustrating. I have also done it when I have done something in my mind at the time, really dumb or something that needs punishment. I always hide it and if someone ever did notice I make up some lame excuse.
Chippie