Most recent: I was taking a plate out of the cupboard while completely zoned out and managed to catch myself across the bridge of the nose, resulting in a very nasty looking black eye.
All time worst: I was taking a brand new big chinese cleaver out of its box and it slipped and sliced my ring finger right to the bone, requiring 9 stitches.
Putting a hand underneath a running lawn mower.
I was trying to put a meat thermometer into a raw potato once while talking to a coworker. Somehow I put it through my hand instead.
I was making the bed and when I flipped the cover it caught the light fixture and it in turn cut a gash out of the bridge of my nose, took stitches & left a scar.