You've probably found them like this one Edna, Ugly Fu**er with his head spilt wide open and that funny grey waxed look. I got as close as I was going and then strolled back to my comfy signal box and called the people who deal with these things.
Another one I saw that I wasn't going to give...
I found one of those once, It didn't stun me as I knew what I was looking for I just remember thinking I'm glad your dead fella as I wouldn't fancy giving you the kiss of life.