Was at my in-laws today and my father in law was starting to work on his 2011 tundra. The battery had a little corrosion on the terminal( not much just some coming out of top post clamp). So he got it cleaned up and put the positive cable on first and as soon as he touch the ground cable to the battery, VROOM! Started on its own. The keys were in his pocket, and as soon as he got in it and hit the brakes it shut off. Thinking it was a fluke he tried it again with the same outcome... anyone know what causes this?