Pic related. When I was a kid I was walking with my mom along the road just down the street by a treeline and tied to one of the trees by it's neck was a baby doll.
Very unnerving.
We never found who did it or why.
Years later I was out with my mom again in another part of the woods and she swore she saw something that looked humanoid and albino, like all white. It scared her enough that she wanted to leave right then.
Still think about both of these from time to time.
I’ve had some close encounters with a moose, a mountain lion, and a lot of bears but they’re not really “unnerving”. The scariest thing to find in the middle of nowhere is definitely signs of human activity when you think you’re all alone. Crude shelters, weird little effigies, anything that makes me feel like I’m trespassing into someone’s space. Makes me very paranoid about if I’m being observed and how well they’re going to take it