Forgot military low-flying, you should try copper choppers. Round here, a MD902 comes racing at low-level over residential areas out of nowhere at full speed so much so that the ground shakes (even more than the odd RAF Chinook that sometimes makes it way round here), does a couple of circuits over a field and then flies off again. Probably looking for someone's missing cat or something. Probably frightened and killed the missing cat from the sheer noise.