From Redditor u/WhyAmINotClever:
This is my dad's story, not mine:
In the 80s, my dad was in the Peace Corps and lived in Sierra Leone for 3 years.
He had a motorcycle (or some sort of motorbike at least at one point) and would ride around the roads when he had free time.
One day he's riding a dirt road that snakes around a small mountainside or hillside past some construction works.
About half a mile after the roadwork, he sees a man on the side of this dirt road on the mountain/hillside just laughing his butt off. And he was blue. Not like painted blue, but blue.
At first my dad rode on, thinking nothing of it. And then it sunk in...that he saw a blue dude sitting on the side of a dirt road laughing wildly.
He turned around and rode back to where he saw the blue dude and there was nothing there. He kept retracing his path beyond the roadwork and never saw the blue guy again.
Later that day he went back to the village he was living in at the time and told the locals about what he had seen.
The locals all laughed and said, essentially, "No you didn't. White men can't see devils."
What made this even more spooky to my dad was the way the guy just completely disappeared when he backtracked. There was nowhere for him to go off the road, due to it being on a hillside and he never found him again on the road making it seem as if the blue man simply vanished off the face of the earth.
Talked to my dad more about this one this afternoon. He said the color of his skin was, like, bright blue, like unnaturally blue, bright blue. He also said he could hear the voice of the guy in his head like he was talking directly into my dad's mind, telepathy-style.