Delirium is a handle I used back in the mid-90s when uploading Doom deathmatch demos to ftp.cdrom.com. It was as in "I left my opponents in a state of delirium." There was also somewhat of a reference to Neil Gaiman's Sandman series, which I was reading at the time.
in reply to Name Space
The name stuck, and when Quake came out, my gang formed "Clan Schizophrenia", who's members were Delirium (myself), Confusion, and Paranoia. As a clan, we failed miserably, our one good experience being a meeting at OSU's computer lab where we fought students from another campus in their lab. We had a snazzy logo of a yin-yang symbol, slightly skewed, with three circles on one side, and none on the other. To be a kid again...
I kept Delirium as a handle to use on newer forums to replace my old 80s dial-up BBS handle, Reflector. I find that both are taken quite frequently by kids, so if you see Delirium on another forum/IRC/what-have-you, it's probably not me. (If you see Delirium on the road, kill him.)