Uncle Stinky· .
Some won't believe me (I was completely dumbfounded too), but I had those exact symptoms once on my Accord. I go out and pop the hood to find my battery had exploded. There was a dent coming out on my hood and the battery itself had part of it's top and side blown off. From what I've been told, any battery fumes that escape are extremely flamable and the spark generated buy my starter when I turned the key caused the explosion. Ironically enough, I was in the parking lot of Sears where I was already buying a replacement battery for our other car.