Apparently I don't order Guinness as much as I should, because it wasn't until recently that I discovered a clanking plastic "thingie" in a bottle of Guinness. Here is what I discovered. It's pretty cool that they went through so much trouble to make my beer-drinking experience that much better, but I was puzzled by the clanking sound when I tipped my bottle of Guinness over to get the last bit out of the bottle. Very cool.