On one of my old servers, there was this guy who could always be found in Trade talking about Arugal... long paragraphs about Arugal. Weird stuff.... for hours... every day. My favorite was the time he went on and on all day about how it was Arugal's birthday. "Happy birthday Arugal! Open my present first, Arugal! Do you like it, Arugal? Oh, I knew you would, Arugal!" Just weird. That server has a lot of ongoing jokes that have lasted for years too, like saying LOL[whatever guild is really bad that expansion/the bad player of the week] or Happy Birthday to this one player constantly, who eventually tranferred because he couldn't take it anymore. (I saw him in Trade on his actual birthday though, which I found out through some silly means, and he was enjoying the attention.)
On my main's server, there's this guy who says things like "When the going gets Hard, the Hard get going!" and "If you can read this, you are Hard!" with hard always capitalized. He says it constantly, although I notice him more around 3-6 am server.