We went to France this weekend and revisited some old caves hidden away in the middle of a forest. They are dark, cold and stretch for miles underground. It was used by soldiers during the first world war.
J took a picture and on checking it noticed an odd mist-like substance in the camera. He took another and it was clear.
He didn’t tell me at the time, correctly assuming I’d want to run away as fast as I could. It’s a spooky sort of place anyway and the forest is alleged to be home to several angry wild boar so I was anxious enough as it was.