I got dobbed in a couple of times for smoking (I was) and continually got lectures and hassle for my like of heavy metal music. I once even got dobbed in for being seen snogging at a bus stop on my way to school one morning.
The incident that really got under my skin was one summer when I was staying at an elder's house and got dragged in to a room by him and another elder and grilled about someone else in the congregation. Turns out she was engaging in a bit of what she fancied with her fiance a couple of months before their marraige and I got hassle for not ratting them out, despite not being close friends of theirs and not knowing anyway.