My daughter's only five years old and she's already learned how to dissassemble and reassemble a gun: I taught her that because I think it could be a useful skill for her one day.
Notes from Wikiquote
From an interview with Giorgio Cattaneo (30 September 2011), "Nicolai Lilin: Violenza utile?", Spazio filosofico, vol. I, 3, pp. 305-309