You haven't seen mean until you've met Orion. This is him as a juvenile, about 4" in this picture:
That pic gives ME nightmares. Check out the teeth on that little bugger.
This is him about 9 or 10 months later, at a stunted size of about 9" (long story, basically got him back from another home I'd given him to, after finding out he'd been kept in a WAYYYY too small tank with poor conditions - keep that in mind to you idiots who keep monsters in stupid-sized tanks). Its a short video of how he felt about me, the python, and water changes:
I had an Oscar that would spaz in the middle of the night. I was afraid that it would bust throught the tank one day. It actually trashed around so hard that it knocked the lid open and splashed my face while I was asleep in my bed about 2' away from the tank. It was about 9"
I had 12" butti about 8 years ago that was the bain of all cichlids every where and would bite anything at anytime i have never seen a single fish so agro i can only compair it to devil's in spawning conditions.