It is easy to get complacent about how you work with dangerous consequences.
Normally when I use a chisel I try to have two hands on it if not striking it. This makes it much more difficult to cut yourself. Yesterday, I was routing a couple of hinge mortises and decided to sit while doing so. So when it became time to pare the corners with my chisel I remained sitting and worked at right angles to my body as opposed to standing and working with the blade going away. The wood gave and the chisel contacted my finger between the palm and the first knuckle. No pain but I knew I cut it as the chisel is sharp, sharp, sharp. A bandaid or two with gauze and I could go back to work.
I should have gotten up, ensured the piece was properly held and and worked above with proper position. I paid the price for being lazy.