I had my first blow up this weekend also. Brewed late Saturday night. AHS Black Ale. Was to lazy to carry it downstairs so I left it in my office.
Yesterday the wife and I took the kids out to Sesame Street Live, came home to a guyser. I looked pretty cool. I got it before the stopper blew out, pressure was blowing foam out of the little holes in the airlock lid, with a cool hissing noise. I wanted to take pictures, but everytime it "erupted" it got all over my desk.
I did exactly what the picture Revvy posted shows with the 3 piece airlock.
I was wondering when it would happen.