Generally speaking, I'm extremely, overly careful with my knives. I've only cut myself three times. The first couple were with a Bradley Kimura 8 butterfly knife. I was used to Manila style butterfly knives, and the Kimura was a Batangas style. Needless to say, I zoned out while flipping and my muscle memory defaulted to grabbing the latch handle, which ended up being the bite handle on the new knife. Those were really only skin deep though.
The most recent cut was the day I got my Paramilitary 2; I decided to oil the blade as I usually do, dragging an oil-soaked kimwipe parallel to the edge. The Para2 came so incredibly sharp that it somehow bit through the wipe and into my thumb, and I didn't even notice until I realized I was dripping blood all over my jeans 5 minutes later. Even so, it was only slightly into muscle tissue of my thumb.
I think I've done pretty well given that I've been playing with knives for several hours a day since my freshman year of college though.