Beer Explosion

After a car ride from Wellington to Martinborough one of the bottles of beer of beer I brewed with Erich and Bruno exploded. It had been sitting still and inside for an hour or so (thankfully in a polystyrene box) since being in the car and then there was a bang and things were wetter and more beery than previously. It's impressive that the beer developed enough pressure by itself to destrow the bottle so completely.