Fast food is everywhere and so is its discarded packaging.
Those expanded polystyrene boxes are dirt cheap and thermally insulating and many people seem to have few reservations about just dropping them anywhere but in a bin.
Today’s invention is to supply fast food in these boxes but to have them formed into 3D masks. The faces could be of celebrities but even more interesting is the possibility of having a box vending machine in each fast food store capable of scanning a customer face and heat moulding a box in real-time (Perhaps this could be achieved by pressing one’s face into a plastic pillow to form a reusable mould against which a sheet of polystyrene could be vacuum formed).
This would give people pause for thought about pitching their own face on the ground: not least because it could identify them later.