Beer Blast

I was recently checking on my beer selection and I noticed a broken bottle in a mix-a-six I bought last week. It looks as if top came right off it. It still had the bottle cap on the top part of the neck. The contents of the bottle was completely dry. It was a bottle of Pig's Ear Brown Ale from Woodstock Inn Brewery. I was disappointed to say the least and puzzled. Leaves me wondering what happened. I'm happy to hear any ideas. I'll be contacting brewery to see if they might have an idea.