Had a bluefin, and named him Spaz (fit perfectly!)
He was such a pain, he would always back right up next to my clown, stick his tail right in her face, and then just flick her and slap her with his tail. I really wish I had gotten pics of it, but he would never do it for the camera. I eventually had to give him back to my LFS.... Here he is, before he got very big.