So I brewed the Janet's Brown extract recipe from Brewing Classic Styles on xmas eve as I didn't have time for an all grain. Everything went well. I cooled with my IC and after 20 minutes I was draining to the carboy. Well, there was a lot of foam, a LOT of foam. So much foam I only got about 5 gallons into the carboy instead of the anticipated 5.5 as it was all spilling out... I pitched the yeast from a starter then left to my parents for the holiday. When I got home about 30 hours later I had steady bubbles, but nothing crazy. I had set the carboy heater to 67 and have since ramped 3 degrees the last 3 days and it is at 70. The bubbles are about 20 - 30 seconds apart at this point and the foam still sits heavy on top. I have swirled the carboy the foam isn't going away. I guess I am not worried yet, and am hoping in another week it will all drop out. But my question is what is causing this. Of all my batches, extract and all grain, I've never had this... Any explanations?