Came across one when I was not much older than twelve sporting a dude with a foot-long penis. For the longest time I thought that was a normal size.
Oh god this... I've had a complex ever since.
Anyway... here's my story. Mine was in, I think 3rd or 4th grade, not quite sure. But, you know there is always that kid that brags about everything, and always has a story that is better than everyone else story? The one that sniffed too much white-out, and you suspected things weren't quite right at home, so you kind of felt sorry for them and let them hang around anyway? I think most of us knew that kid...
Well, one day he busts into class claiming he found one of these stashes in an old shed that he wandered into while walking to school. None of us really believed him, but he said he had proof, and that he would show us during our restroom break. Sure enough, dammed if he didn't produce a pretty hardcore nudie mag out of his backpack. We all stood around it like Indiana Jones uncovering the Ark of the Covenant. Interestingly though, he then ripped out a page... stuffed it down his pants... then told us all that's what fucking a woman felt like...
Of course, some of us didn't buy the idea that he just randomly happened upon this treasure (probably snatched it from his dad or something), and that he needed to take us to the mother load. Take us he did, and what a load it was. The things I saw in that shed that day were burned into my mind for years. Really, really sick shit. Sick for a kid anyway. I'd shrug it off now.
Turns out the shed, and the property it was on, wasn't entirely abandoned like we thought. Some reclusive old couple had lived there for decades, or even centuries, I don't know. Ended up with the police at school asking about some "trespassing kids", but it never amounted to anything. Years later I just assumed that the couple didn't push it because they had some dirty laundry they didn't want aired.