Brewed an extract version of this on Monday and woke up Tuesday to an airlock full of hops! I went to pull the airlock out and as soon as I touched it, it shot into my hand. Probably the only reason it hadn't blown was because it was a brand new lid. Luckily it didn't gush any krausen, just sweet hoppy CO2. Rigged up a blowoff tube before work. I'm excited about this one. I have an ounce of Centennial waiting in the wings for dry hopping.