I've got quite a few.
My dad was out bowhunting alone last year in new territory and he was driving around scouting for elk. He stayed in the car because it was a dark and cloudy day, seeming like it would start to rain any second. Although it hadn't started raining, he was hearing a lot of thunder. Anyways, he was driving along this dirt road, and on the side of the road he sees a man, not in camo and without a weapon, holding his dog by his side and his arms at his sides. My dad waved because it would be awkward not to, being in the middle of the forrest and all, but as he drove by the man just watched him, with an emotionless face. My dad said the look was "unwelcoming". Of course he keeps driving and maybe ten minutes later, he sees the same man, with the same dog, and the same expression.
I wish I was there because this is pretty scary to me.