Yesterday an interesting accident took place in the international London metro station. The usual hustle and bustle of the terminal has been interrupted when a sudden explosion has been heard, with smoke quickly filling the hall. People, sadly used to terrorist attacks, started to run, but soon stopped when it became clear there is no danger: it was a smartphone or, more specifically, smartphone’s battery that was the culprit. The specific model has yet to be recognized, though some speculate that it may be Sony Xperia; the phone’s owner has not been found. Nobody has got hurt, but a few people missed their trains. Could have been worse.