A little white thing, whatever the F--- thats supposed to mean. I've had many beers (mostly local) but I have never found something inside my beer bottle! It was this oddly shapped little white thing. I had to break the bottle to get it out. what the hell. I am decently drunk and confused.
MAybe your right, I usually only drink can beer, guiness cans are the greatest. But I've had the bottles, I just dont have a memory