There was a good one I saw a few years ago about the Amish "rite of passage" called Devil's Playground. Basically, the Amish send their teenagers out into the world to face all the world's temptations and then it's up to the kids whether they come back or not. The documentary follows a few kids through their wild years. Surprisingly, most of the kids end up coming back and leaving their wild days behind them. It's completely opposite of what most of us would do as parents. It's a fascinating documentary. I did not know a lot about the Amish and It was kind of shocking to see these kids smoking and drinking and partying.
Devil's Playground (2002) - IMDb
Devil's Playground (2002) - IMDb