My hand usage is the most unusual I think. I was born right-handed, but when I was a really little kid, I forced myself to use my left hand, because the cars' steering wheel is in the left side (don't laugh!). Since then I use pen(cil)s, forks, spoons, knives (but for the classic fork+knive combo I still use the right handed version), screwdrivers, etc. with my left hand, BUT I use scissors, mice, lighters and plenty other things with my right one.
When I was learning to write (I was about 4), I was writing somehow mirrored (rigth-to-left) in the very beginning, and I can write backwards even today without struggling.