When I first started in usnet newsgroups, participating in a weekly wallpaper contest, John Daly the golfer was very popular. Every time he tee'd off, someone in the fan group would yell "You-the-Man" at the top of their lungs. I thought it was pretty comical, so I adopted Utheman as my user name.
My avatar is a result of playing around with a green laser shining on the crystal of my Submariner which gave interesting results. I called this one my "Sub-Milgauss".