Okay, here is me: I used to run a bbs for 4 years, 90-94. I went through several handles (The White Horseman, P.Opus) before I got to Riffraff. I always used to sign my messages:

Just some other...
Riffraff

It was original with me (I hadn't yet seen Rocky Horror). Then I got The Pre-History of The Far Side, when he was talking about his riffraff in the zoo sketch. I thought it was funny.

Anyway, usually I'm pretty lucky if I can get plain riffraff. I used to be riffraff@gte.net, and riffraff@tampabay.rr.com (which is still active, amazingly enough). If I can't get it, I either go for /riffraff0+/, or riffraff169 (169 is the opcode for LDA in 6502 assembly), or riffraff234 (234 is the opcode for NOP), or even riffraff0xea (0xea is 234 hex).