Dunno if it's been mentioned before, but I like the story behind Faraz Jaka's screenname. When he first started playing poker as a clueless newbie in college, he'd play any two suited cards. Because of that, he made flushes more often than his pals. They nicknamed him "The Toilet" because he was always flushing. Little did anyone know that within a few years he'd be playing nosebleed stakes under that username. Evidently he built his roll up to 170K, but then flushed it all away like a proper degen. "The Toilet" turned out to be a very apt name. He's an excellent tourney player now.
I always loved hentai_party on Party Poker back in 2005. Best I've seen to this day.
I played as KhaledSheikhMohammed on PP until too many people complained about my anti-American chatboxing. I remember spending an hour on the phone with customer support until finally agreeing to switch it to NawaqAlHazmi.