Back when I was a kid we lived in the country. There was one year when Dad had about twenty or thirty chickens, and one day he slaughtered them all at one clip. One got away from him after he cut its head off; I still remember watching it run around the yard and my mom screaming her head off.
I was probably about nine when this happened, and it was years before I would eat chicken again.
My next door neighbor used to raise Guinea Hens. They were so stupid that they'd fly up on the woodpile and not know how to get down. Guy used to knock them off with a broom so that they'd not starve to death. True story.