It appears that Samsung could have a problem on its hands with the new Samsung Galaxy S III phone. One user, dillo2k10, had his brand new Samsung Galaxy S III phone burst into flames which driving, after which he heard an audible bang. He escaped just fine, but is car wasn't so lucky and now has molten plastic in the cup holder.
It's not the first phone to ever explode in transit, but the damage to the casing looks to be pretty bad. That said, the screen apparently continued working and the only problem was that there was no longer any working reception. It's not clear what caused the phone to spontaneously explode, but you can be sure Samsung will be looking into it closely.
Samsung has updated its blog with a message to that effect:
Samsung is aware of this issue and will begin investigating as soon as we receive the specific product in question. Once the investigation is complete, we will be able to provide further details on the situation. We are committed to providing our customers with the safest products possible and are looking at this seriously.