My first ever orgasm came from an electric fence.
I don't know if this really fits here, if it doesn't then sorry I'll delete.
When I was young, about 12 or something, I was walking through the woods near my house. There are a lot of farmlands around here and some have electric fences. Me being young and stupid, I wanted to cut through a field to get to the other side quicker, I knew the fence was electrified so I used a tree to jump over it, the issue was that there wasn't a tree at the other end, so I used an old bucket to try and jump over it.
Basically the bucket fell away from me and I landed crotch first on the fence. To this day I've never experienced so much pain and pleasure at the same time, or even separately. I fell off onto the grass, shaking and orgasming for almost a full minute. I ended up wetting myself and having to spend an hour walking back home, my legs were too weak to walk for the first half hour so it took way longer than usual to get back.
It was the most intense pleasure ever, and to this day I've always wanted to try and recreate it, for obvious reasons I haven't and probably never will, but it haunts me that I'll never feel that pleasure again.