I'll start:

In my mis-spent youth, I was quite the dare taker. There were few feats of stupidity that I was not only unafraid of, but eager to try, hoping to impress my sordid cohorts. I guess it was more testosterone driven than anything else, so my friends all called me "Guts". When I first got online with "shudder" AOL, the nick "Guts" was taken, as was "Guts 1", "Guts2", etc. Exasperated, I tried "Guts3d" and lo and behold, it was available. My fate was sealed. Top that one, oh Fuzzy Ferrit!