This took place about 11 years ago in Monterrey, Mexico to my younger brother. He was about five years old by then. There's a public park in Monterrey, Parque Fundidora. From 1900 to 1986, what now is a public park used to be a foundry property until it went bankrupt. The park has some buildings where workers used to melt metal or something, and along with these building, lots of stories of people who died in accidents when the foundry property still worked.
The park isn't popular for that, though. So people go there expecting to see the buildings, walk, have a picnic, but nothing like ghosts or what my brother saw.
My aunt once took my cousins and my brother there when they were small. My brother, as I said, was about four or five years old; he was the youngest one. Still, he says he remembers what happened there like it happened just yesterday.
It was about 6 p.m. and they were leaving. They stopped for something, I don't know why, maybe to buy some food before leaving, like sodas and chips. I just know they were in a place where you stand in line. People would stand in line beside some tall bushes (that are still there), but that day the place was pretty much deserted aside from them.
When they finished doing whatever they were doing there, they started walking away. My brother bent down to tie his shoelaces and the others were walking in front of him, not knowing he had stopped. He hurried tying his shoelaces, and then he noticed someone staring at him.
He looked up and saw a man, a rather small man, with a wrinkled face, tanned or burnt skin, and a long reddish beard the color of his skin. He said he was of his height and was hiding in the bushes. The "man" gestured him to be silent, and my brother got scared. He said at first he thought he was a kidnapper, and he was going to kidnap him.
He ran away to catch up with my cousins and my aunt and he told them everything. Although he didn't put much importance on how the man looked, he simply said, "A man wanted to kidnap me!" They didn't say anything.
Growing up, we realized what he saw pretty much was the same description of a leprechaun. Years later, the rumours about leprechauns and goblins inhabiting the park started to spread. But this happened way before that. Although people who go there are rarely lucky to find one, we always try to see something when we visit that place.