When I checked on the brew at 0900 I saw a very vigorous ferment--the carboy plug had been shoved out by a thick jet of foamy goop! There was a nice sloppy trail of it down the side of the vessel. It was easy enough to wipe up, and I keep the carboy in a big circular plastic bin for just this sort of eventuality. But, wow, what an active wort! They call this strain a "true top-cropping yeast" and I can see why. Looks like this beer will finish the primary fermentation damn quickly. We'll see how it settles over the next few days and then rack it off to a fresh carboy.
a.d. XVII Kal. Dec.