I was stocking my bottle coolers at my restaurant today when I noticed Dogfish Head 60 Minute was getting low. I went down to the big walk-in to grab another six pack and upon removing it from the sealed case I noticed something odd: one of the bottles were completely empty. I wondered if perhaps there was a crack and the beer leaked out, but the bottle was fine; the crown was sealed perfectly too. I was left a perfect 12oz bottle of air, the good 'ole 5-pack. This is the first time I've ever come across something like this, but I'm wondering if anyone else has. Is this common? Does anyone else have any wacky experiences like this that have left you scratching your head as this has mine?