Since I haven't been here long, my favorite was when someone posted about someone elsing posting about the online bullying article, and then Mantra did his ice cream thing.
This thread has suffered the plague of the newbie. I can tell you, when I joined, this place was full of things a thousand times better than anything we have today. I can only imagine the madness that was happening before I arrived.
Best moment? The first attack against me. I remember it well. It was K_A bitching about me digging up old Square threads. The thing is, the link I followed from Google went to this weird version of the site where there is only text. There are no post dates there, so I couldn't have known.
Also, when I dug up the thread about me in the Mod section. I can't remember if it was when I was banned or warned. Either way, it was a hoot to read.