Yes, I remember those mouse. Used one on Sun Workstation during my internship.

Now here is a neat trick which I used to impress my fellow interns. Try placing the mouse on a CRT monitor and watch the mouse cursor moves. Apparently, the scanning lines on a CRT monitor works like the shiny grids on the mouse pad and caused the mouse cursor to move :P

Did any one try this using the new optical mouse? I am using a logitech optical wheelmouse but I can't tried this anymore caused I used a LCD monitor (no scanning lines)