I have to say its the first time I've seen them here and I was so livid! next morning I was out there crack of dawn with torch looking for bits of lantern before the goats came out, luckily none in their paddock but they must have landed somewhere - cows, horses, sheep, donkeys and poultry all within seconds of our land.
you are so right, it is litter! sometimes we get bits of balloon landing in our field, quite often from the wacky warehouse 5 or so miles away, very annoying.