This one has bugged me for a while because I couldn't have an auto mechanic answer exactly why this worked. I had a 1995 Toyota Camry LE where the battery was seemingly dead. Didn't matter how many times I tried to crank it, it just didn't want to turn over. You could hear it struggling. Something possessed me at the time to spray tap water on the terminals (think something like enough water to connect the two terminals). I know it's stupid now, and it's way in the past, but it worked. I got into the driver's side, cranked it once and the car fired up. You could see the water jump and evaporate every time the starter demanded current from the battery for the sparks. I was able to drive it to an auto parts store and buy a replacement battery. Question is, why did the car immediately start when I put that water on the 2 exposed terminals?