I watched a QA technician set up the board. She plugged the negative lead into one of the negative lugs, then brought the positive lead from the battery up to the other negative lug on the board! As it approached, it spat sparks and the technician jumped. Then, gathering her resolve, she pushed the lead firmly onto its connector. The battery cables were instantly called upon to deliver several dozen amps; they fried off their insulation, burned a pattern on the desk, and sat there glowing sullenly until someone managed to tug them off the battery with a pair of pliers. The coolest part was the way a perfectly defined smoke shape went up to the ceiling, preserving the exact shape of the cables as they were lying on the desk (highly theatrical).