I've managed to jab and slice myself more than a few times. It seems like no matter how careful you are it can still happen, and if you aren't careful to begin with...
One time I was using an Xacto blade to strip some insulation from some wiring. Somehow, the blade slipped and went into the side of my leg, just beside the kneecap. Actually had to go to the ER and get stitches for that one. Other than that, I've been lucky- when I get cut, I just clean the wound and grab a tube of superglue off the work bench to seal it.