Many of our kitchen accident stories have been posted in the thread, "Never again will I..." in this forum.
My worst was when I was also using a mandoline; wearing a cut-proof glove, no less. Trying to slice a rutabaga my knuckle went into the blade, though the glove and I got a big cut and a very deep bruise that didn't heal for a very long time. So much for 'no-cut'.
These days I handle that mandoline with great care.