Mine originated from a Shadowrun messageboard, i wanted something unique, yet still 'me'. I made a vague reference to an even more vague fictional character that i found inspiring. "LaughingOne" was my handle for a long time until the moderators at the Shadowrun board decided that there would be no usernames at their boards that used character names from the Shadowrun universe. Many thought that "LaughingOne" refered to the Shadowrun character "Harlequin", it wasn't, but i was forced to use a different handle (very annoying because i use one handle all over the interet). So i decided to drop the vague reference and use the character name, it was unique enough and the character name has over the years become even less unknown then when i picked "LaughingOne"...
It's quite... 'unique'... *grins evily*