When I was a very young boy, about 5, my parents had been using an old-fashioned mechanical alarm clock for years, complete with two bells on top of it. As they replaced it, I got it - and felt the irresistible urge to take it apart. Just driven by sheer hunger to see the insides, and understand. Same thing with my father's watch.
It is still the same urge that drives me: using a machine whose workings I don't understand drives me mad.