The fact that this brewery says that it is not uncommon would have me concerned when purchasing any of their products in the future. It is pretty uncommon in the commercial beer market. That being said, it still does happen.
I had a bottle of Snoqualmie Falls Avalanche Winter Ale sitting at room temp on the bottom shelf of my bar. I was relaxing in front of the television when I heard a loud POP followed by the sight of beer flowing through the slats in the shelf onto the floor. Sure enough the 22oz. bomber had exploded. Luckily it didn't take out the bottle of Macallan 18 sitting next to it.
I mentioned it to the brewer at Snoqualmie and she was really surprised since they don't bottle condition their beers she said. They filter and force carb. It was almost as though she didn't believe me but I assure you, it happened.
After watching that video, I decided I better open the bombers of a friends beer that he gave me because I noticed the caps bulging. Glad I did, it couldn't been a disaster. Here's a picture of them sitting in my sink.