Well, being a bit jet lagged after my trip to warm sunny Korea. (dayjob sent me there for two weeks of fun) The ol ZJ had a mostly flat battery. Not a problem, I just roll the car out, hook up the jumper cables being careful not to short the ends and then proceed to try and connect my batter backwards.
The nice spark reminded me of just what a ducking fumn thing I did. :/
Lucked out, I didn't just clamp the jumper on but only brushed it and connected it the proper way.
This getting senile sucks.