This story happened when I was 21 and I used to go climbing mountains during the weekends. By that time I don't remember anything I liked more than climbing, so every weekend I took my gear and drove to the mountains one hour away from home. I also used to to take my tent because I loved sleeping in the mountains and coming home the next day.
So one Saturday morning I took my gear and tent as usual and got into my car. When I arrived there I found my friends and they told me they didn't feel like climbing as someone had just suffered an accident and the police were trying to find out how it happened.
We didn't go back to the city. We stood there by the mountainside in the camping site. It was something like a farm, but not really. It was a large extension of land with one very small "house" in the middle, and by house I mean it was just a room where there was only a table and a kitchen for us to prepare a, not that fancy, meal.
After talking for a while, showing tricks, setting the tents and having dinner (we didn't drink as we were going to climb the next morning at 6am) we all went to sleep.
At 4am or something like that I felt the need of going to the bathroom. I thought of the possibility of holding it until there was light outside, but that couldn't be done. I took my flashlight and went out.
At one end of the land there were the bathrooms. They were far away from the camping site so I started singing a song to myself to soothe me. You could easily see the bathrooms from the distance because the lights were on. So when I got there I got in (no door) and there were 8 toilets, but no doors! Just a wall separating them, so I went to the last one figuring out if someone came in they wouldn't see me with my pants down.
When I got out of the bathroom I started walking to my tent, but suddenly there was this sudden breeze accompanied by a woman's sad sigh. I looked back and standing there in the entrance to the bathroom there was a woman who looked very sad and had her eyes on me. I was already at the halfway point between my tent and the bathroom, but I kept on looking at her (mostly because I thought "if I look back she is going to be standing there for sure"). She was just standing there and I just stood there looking at her I don't know for how long. The thing is, I was really scared, but I have seen these kinds of things a lot, and once it happened to me that I looked back and the ghost was near me, so I didn't want that to happen again. I thought that seeing her from a distance wouldn't be as bad as if she was standing next to me.
I knew everyone in the camping site and I had been inside the bathroom so I didn't know where did she come out. After an eternity she disappeared with a second breeze and I ran for it. I got into my tent and promised to myself I would never ever drink a lot of water just before going to bed.