Once back in high school I was just doing the final assembly of a Johan Sox and Martin cuda when something went wrong(can't remember what) and I smashed it to pieces with my fist. The problem can be traced to lack of experience building and troubleshooting those common problems that crop up from time to time. Now if something frustrates me, I just put the project away for a while until I come up with a better way of doing things. No anger problems anymore. lol