"Human Error" sounds so much better than the alternative:
You're a stinking moron.
I was in a rush yesterday evening to finish up barn chores early as I had several things going on aftwards, away from home. Ran the goats into the barn for their PM grain rations (and even though it was two hours early, they still act as if they're half starved), forked out some hay, tossed a scoop of scratch out to the chickens, fed the Cornish & Barn Mutt chicks their dinner and filled their water container, gave Pan his bowl of grain & flake of hay (godalmighty doe he stink!!) drove up to the other barn to feed and water Ms. Melman and Nugget and was slinging gravel as I peeled out of the driveway.
Paul got home later than I did so I asked him to close up the chicken shed on his way in.
And since I didn't shut up the chickens, I didn't notice that I had left the still half-full 5-gallon bucket of water in the chick's pen.
So this morning I let out the chickens, open the barn door to the chick pen, and see one of the Barnyard Mutt chicks had fallen in the bucket and drowned.
Another life needlessly ended on account of Human Error, I mean, because I'm a stinking moron.