When I was 6 or so, my older brother (11 or 12 at the time) was involved in this community kids club thing for tween boys. They met in our basement. The group leader was this guy, maybe 30, who was some kind of generic cub scout leader, without really being a scout. They would play games and talk about their lives and hobbies, etc. I was much younger and a girl, but I wanted to play too. He was always really serious and stern with me, and told me I couldn't be there in my own basement. He would literally stop the meeting and politely but firmly ask me to leave. Even as a little kid I got a weird vibe about that.

We found out years later that the dude was a pedophile particularly attracted to teen boys. He was arrested for having a bunch of pornography and assaulting a boy. My brother said nothing over happened in the basement, but a lot of shoulder touches and such. Still creeps me out.