Cause I just cut the tip of my left thumb off.
Fortunately I only barely got to the meaty bits, so it was mostly skin.
I also managed not to bleed on my pristine final model.
1) holding your arm above your head for this long hurts worse then the cut.
2) sharp exacto blades hurt less then dull.
3) typing right-hand only is hard. When Ido type one-handed it's normally with my left...
I think the bleeding has stopped so time for bandages.