I've spent a lot of time outdoors, and have had unnerving experiences, but nothing could compete with being attacked by pecking turkeys
That was a funny story (although I imagine the experience itself was like a horror movie).
I've been menaced by a badger, had my head sniffed by a bear while I was sleeping (through tent fabric, but still..), been stalked by a mountain lion while fishing, and been almost-snakebit a bunch of times. For the number of experiences, none of them are really good stories unless I were to embellish them.