I think the best part about being a guy (besides peeing standing up) is fixin' stuff. Its especially nice that you don't actually have to know how things work to fix them.
So my dad's new wife (which is working out great, she's making the house not look like a dump anymore and keeping my dad in line) fried the microwave while cleaning it. That should be a lesson in and of itself. Anyway, my dad and I decide that we're gonna fix it, so we just start taking the thing apart. We don't know how microwaves work, or what's wrong with the thing, but we're just goin' for it. So we get the whole thing apart and we actually find the problem: the circuit on the keypad got fried and there's an open. So we (ingeniously) take fibers out of some wire layin' around and patch the open circuit, and it was working, except there were still some connections not complete, so we thought maybe the connecting cable back to the circuit board was messed, so my dad sanded the connectors to try and clean them, but it turns out that they were just made of a thin film of metal over plastic, so the sanding took the metal right off, and basically ruined the cable.
So, we can (kind of) fix things without knowing how they work, but we can kind of break things that way, too.