In either late 1977 or early 1978, I was visiting my then wife’s remote village in southern Luzon in the Philippines. One day we went to visit an even more remote farm, and had to walk through the forest to get there. At one point I needed to urinate and so slipped behind a tree to do so.
That night I was struck with extreme painful constipation. There was no doctor in her village, so a traditional healer was called. After examining me, he asked if we’d been in the forest, and upon hearing that we had, asked if I’d urinated on a tree. After admitting that I had, he that was the cause, that spirit that lived there, translated for me at the time as “fairy,” was retaliating. The condition lasted until we returned to Manila.
One could argue that it was simply a reaction to food, but I had by that time been living in the Philippines for over a year and was acclimated to the diet, even to the point of eating dishes foreigners typically avoid.