So, I double-pitched my Imperial Stout on Saturday night in my standard plastic bucket. When I woke Sunday morning, the airlock was bubbling happily. Took the kids to the park, and upon my return I found that the froth (krausen?) had filled the airlock. I put a clean airlock on it and started some yardwork. When I came back inside, the bucket was actually BULGING (top AND sides), and I was getting bubbling all along the gasket as well as the airlock. There was a big pile of huge frothy goo all on top of the fermenter around the airlock. To prevent an explosion, I just pulled the airlock out of the bung and let it ferment away. (I also put the fermenter inside my big kettle to catch any overflow before it hit the floor.). By this morning, ithe fermentation had settled down, and I put the airlock back on and cleaned the top of the lid. The batch is now bubbling away at a rate of about 40 normal bubbles per minute or a bit more. Was there a better solution than just pulling the airlock? I am considering drilling holes for two more airlocks in one of my lids, for use on really big beers. Would three airlocks do the job for a high gravity beer?