[Vegetable]

Earlier today I'm working on my computer when I hear a loud bang on the other side of my house (I am the only person home). I look everywhere and finally find the culprit in the pantry. The beer had apparently exploded out of the box it was in, rocketing up to the next shelf and then falling onto the wood floor. This is a Sierra Nevada IPA that I bought at Costco a couple months ago. Wondering what causes this, because if I wasn't home this would have ruined my new wood floors. Should be said that although the Pantry isn't climate controlled, the temps in there only vary a few degrees during the day (68-74F).