You know, now that I think about it, I don't know that he has done anything perticularly monster'like. I think he got that name from Kunan, his furkid brother. When Zingo was just a kitten he would jump on Kunan and suck on his ears...at that point there was a great difference in their sizes and Kunan knew enough to not get rough with his little brother. We just started calling him Monster and it kind of stuck. Now they are a little more matched in the size department and Kunan does not cut him any slack at all. One day Kunan was very deliberately pacing towards Zingo, who was backing up very slowly as Kunan came toward him. Kunan got Zing into a corner and just stared at him for about a minute. You could almost hear Zingo " Uh oh! I'm toast!" Kunan just kind of huffed at him and walked away...it was so funny to watch tho....kind of a "Don't mess with me" kind of day...