So I went down to check on my stout (one week in the bottles) and I was reorganizing the bottles on a shelf when I realized one of the bottles had this foam gunk on the neck. When I poked it, it was all hardened--but other than that, looked like beer foam. I took out the bottle and realized that a nearly perfect tear-shaped hole had been punched in the bottle. Surprisingly, beer wasn't everywhere--just about a gulp-sized amount that was where the hole was. I found the piece of glass, perfectly whole. Now, what the hell could punch a perfect hole like that? It couldn't have been bottling too early, then all the beer would have exploded everywhere. I guess I could have bumped it when I was bottling, but then it seems like the glass would have been broken in, not out. Oh well, life's a mystery. At least I only lost one bottle!