Most likely this:
http://i38.photobucket.com/albums/e120/Sugarfuzz/WTF2.jpg
http://i38.photobucket.com/albums/e120/Sugarfuzz/WTF3.jpg
http://i38.photobucket.com/albums/e120/Sugarfuzz/WTF1.jpg
That is what I found upon arriving to work today (Advance Auto Parts). A customer brought this in claiming that his battery had "gone bad" and that he wanted it exchanged under warranty. He also claimed that he had not hooked it up backwards. I am certainly not a battery expert, but I believe this has to be the result of reversed polarity. Maybe someone could shed some light on that one for me. I obviously facepalmed when I saw this, followed by laughter, and then the obvious cellphone pic for your viewing.
The car was a '38 Buick. The manager exchanged his battery under warranty.