This experience didn't happen to me, but it occurred while I was around. This happened probably around the mid 90's, my parents, me, and my brothers and sister went to Mexico to visit my father's parents. Note: this happened to my older brother.
It was a small town or village, in Mexico, I don't know, called Guanajuato or something pronounced that way. Well, my grandparents allowed us to sleep in my aunt's old bedroom while they slept in this tiny room in the porch.
My brother recalls, waking up in the middle of the night and there was a black figure sitting in this rocking chair. We slept on the bed together my brothers and me, and my brother told me that he was scared senseless. The black figure sat there, he described it, with hand on chin, just staring in to the darkness on my grandma's old rocking chair.
He then called out to the figure "hey "and it just turned to him quickly and all he could do was close his eyes and hope it would go away. He was seriously scared. Then he opened his eyes again and looked around the room and the figure was gone seconds after he witnessed it. Just gone. With no noise. No doors opening, no footsteps. It just vanished. He still gets chills whenever he speaks about it.
When I get the chance I talk to him about the black figure in the shadow sitting on my grandma's rocking chair, starring into the nothing, and ask him, maybe it was this, and maybe it was that? Grandma happened to walk in the room or grandpa was just checking on us maybe. He continues to deny it.
I still believe him, and I feel saddened for him experiencing that and all because everyone denies his belief, but me. He asked my grandma and grandpa, and my dad about it and I think they have yet to witness a figure sitting in the shadow. It still gives me creeps just thinking about it.