Well, it's not that much of a mystery, it's a small black bag, tied reasonably securely, which obviously contains some canine leavings of a fairly solid nature (canine, not feline because the owners of felines give not one jot about what their moglets leave where). The mystery is why someone felt the need to lob it over an eight foot high wall. The wall in question is the back wall of a row of garages which must be at least ten feet deep so it was some throw.
Our garden is around 200 feet long and is enclosed on all sides. Why couldn't they bothered to carry it home to put in their wastebin? Why do I have to clear up after them? I am now tempted to bag up some of my leavings and hurl them in return.
Hades is indeed other people and their lazy behaviour. DD
Have you got the despatches? No, I always walk like this. Eddie Braben