AAAAAAARRRRRRGGGGGGGGHHHHHHHHHH!!!!!!!!!!

I am really, really getting close to the limit with my co-'worker', whom I have gone off on here before.  Now not merely content with keeping his job despite massive unexplained absences, he's getting my boss to pay his thousand-dollar certification fee, and he CONTINUES to get mad at me for not doing his work for him, especially when he doesn't even explain to me what I am supposed to be doing.

I just have to vent, but it's not helping.  I am really mad.  I really, really want to hurt him.