I killed a bird once after it flew into a window. When I found it, it was already fucked up, so it was a mercy killing.

I tried to break its neck as the quickest way. Boy does that not work at all with birds.

Ended up stomping its head. The body then rolled in a weird, active way. Like the wings did some kind of motion that led to the body somersaulting rapidly away. It went maybe ten feet then stopped.

It was a pretty fucked up experience to have while stoned.