Not long after being introduced to this wonderful device at Halton, one of our entry found that it had a secondary use..... as a deterrent...notably by dropping one from the top floor of the block in the direction of another entry who had decided to pay us a social visit one evening.
Clearly, this was not the most astute move ( although strangely enough, we never had any more social visits after this one ) given the potential for a lot of paperwork had said bumper made contact with a human first, rather than the tiles at the door entrance.
Said member of my entry was later "offered" a move...to the Reg't.