So I haven't brewed in 4 years and I've encountered something I have never had this problem before. Basically we had left over grain and powdered malt from 4 years ago so we got new hops and yeast and proceeded to brew. After pitching the yeast I went to bed, only to awaken 4 hours later to find my airlock full of wort and foam coming out of the holes on top. Soon after I woke, while trying to figure out what to do, it popped its top. After checking to see if I was a victim of a drive-by, I cleaned the airlock, it was plugged and attached a blow off. Now foam is being pushed into the blow off bottle (I don't know what its called) and its gassing at a rate that would make cows blush.
I am afraid that its going to clog again and I won't catch it in time, resulting in a big mess. Did I do something wrong? We used old grain and malt but used the same brand and types of yeast and hops that lead us to 5 successful brews before. The room wasn't that hot - 65ish.