This happened to me a few years back. I was poking around some junked cars on a friend's property and turned around suddenly to see "someone" behind me. Nearly crapped myself. Turned out some kids stuffed an old black wet-suit with straw and hung it in a tree as a joke. I didn't think it was funny at the time but laugh about it now.
I just know I'm going to find a dead body one of these days. Not too long ago one washed ashore on a beach I regularly hunt, but I didn't go there that day, I just heard about it on the news.