Good topic QNIM - this has certainly brought a few polarised opinions out of the woodwork.
Some time back I was tracking to the west overlying YBRS at 2000' just under 8/8 cloud. I gave an overflying call entering the CTAF boundary at 3NM. Shortly after when I was about 1 mile to the east of the field, I heard a call advising that canopies had been dropped. I did not feel entirely safe to say the least, as they could easily have appeared straight out of the cloud right over me or directly in front of me.
I made a radio call asking the pilot (somewhat facetiously I admit) which hole he had dropped through and guess what - no answer. A subsequent CAIR about the matter drew a reply that there was nothing that could be done about it as it was private ops with little likelihood of a potential accident. Who agrees with that? Here's hoping that the regulators will finally do something to stop such potentially dangerous situations.