ORIGINAL: quiksilver

The first surfboard I ever rode was a Quiksilver nine footer. The one I have now is a QS too.

On a deeper note - Quicksilver is another word for Mercury - Latin for cwicsilver - "living silver"
in English, it has been held to mean "liable to sudden unpredictable change; "erratic behavior";"mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, daring the next"

I thought it was a pretty good fit for my personality and past - so anytime I need an internet handle, that's what I go with.

Also, when I was a kid, I used to shoot up the neighborhood cats and birds with Quicksilver BB's.