Over the Memorial Day weekend I brewed two batches. Each batch used half of the same yeast cake and had similar recipes. One was a wheat and one was a rye. I put blowoffs in both. They took off quick with nice thick krausens, but the rye had more wort volume in the carboy, so the blow off was necessary there. By this weekend the rye had settled down some, so I cleaned up both and put in airlocks. This morning I went down into the basement to find that the wheat was coming up through the airlock after a week of solid activity.