The other day we were recording the band Flowting Bridge in our Randolph studio, a large garage. We have a decent live room area, and a wall to separate the control room. We were doing live recording with a miked amp, and since there is a back entrance to the live room, we had the bright idea to use the great outdoors as the "amp room". So we put the amp out there with an SM7 on it. At one point during the day, a helicopter flew over at low altitude (coming in for a landing in town). Fortunately(?) this happened while we were on break. My first thought was, "phew, glad that didn't happen while we were recording..." and my next thought was to BOLT inside and hit record on the console. I ended up with a "field recording" of the flyover, which the boys decided they will use on the album as a hidden track. If you'd like to check out the sample, I uploaded it to freesound.org here. Enjoy: http://www.freesound.org/ people/doctor567/sounds/161579/