This is my third story, as usual I am so sorry for my poor English and will try my best to explain this the way I can.
This incident happened not to me but to my grandfather (his name is Edmond) a long, long time back while he was very young. Now he has passed away but he told me this story when I was a kid and asked him why he's getting seizures time to time the below was his explanation;
In Sri lanka there is a town call "Kiribathgoda" now a days it's a sort of modernize city but back in 1930's this place was half Jungle village.
Edmond and his family used to have a paddy field, and all together he had 6 brothers and 3 sisters. (Guess those days they had too much free time:)) ) Every evening two brothers have to go to their paddyfield and spend the night guarding for wild animal attacks.
On this particular night Edmond and a younger (his name is Sunny) brother were on duty and between 3 and 4 in the morning it was so cold that those two started shivering, so they decided to come back home which is about a mile walk.
To get home they have to walk through little forest area with some grown trees and debris.
While they were walking and talking, Sunny who was walking behind Edmond has said that he needs to pass urine and stopped but Edmond kept walking because he heard the footsteps and the short replies (Yes and No's) of Sunny following him behind. Edmond kept on walking and talking mainly complaining about the cold weather and asked "so don't you want to stop to pass Urine" but no reply. So he turn back but - no one was there.
Edmond got very scared and fell down with a seizure. Sunny had carried him home safely but with high fever of which Edmond got cured some days later, but suffered time to time of a seizure. I too witnessed when I was young and believe me it's really scary to see.
Sorry the story is too long but hope you guys enjoy. What I have explained is what I have heard from my Grandfather exactly.