If you don't care for the animated gif referencing one of the best "evil" villains ever created in an anime series from the show cowboy bebop, I could change it to an animated gif I made myself a long long time ago from one of my other favorite shows:

I doubt many people would recognize where that one come from though.
As for the topic of being "nice" on the forums, it isn't required for people to be nice. It's simply required that if you don't have something constructive to say, you don't say anything at all, or else you are given a timeout.
Some of the older members will disagree and some may agree with this, but if you were around the forums say, oh, say 2002, the atmosphere around here was quite different. Flaming ran rampart, people avoided the forums at all costs, and generally it was a cesspool of off topic, random dribble.
Some people with lower maturity levels may wish to go back to those days, and if they do, then they are freely welcome to make their own forums and post all of that stuff there. But on these official forums, rules have been set in place to allow for the majority of people to have a pleasant time while using the forums and allowing for them to feel welcomed being here.
I'll go find an old post......
http://hydlaa.com/smf/index.php?topic=850.0