Brewed a barleywine last night, pitched on a yeast cake of nottingham from an american pale ale. I had an OG of 1.094, and the bubbling started within the first hour. I realized I needed to hook up a blow off tube. This morning I came down to find an insane fermentation with foam pouring out the blow off tube and about a gallon of beer spilled out of the blow off glass. Fortunately the temp didn't rise above 68, and I moved the fermenter down to the basement where the temp is around 55. Its still aggressively fermenting and holding a temp of 68. Hopefully everything settles out soon, I'm sure it will, I just wasn't prepared for such a loss from the blow off tube, it may be as much as 2 gallons lost
It was a 6.5 gallon carboy, with about 5.75 going in.