I sometimes see young men who have been facially disfigured in a brawl with someone using a broken bottle or glass. This is a problem significant enough for pint glasses themselves to have been redesigned.
Today’s invention is a simple device to be used in pubs. Before a bottle is de-capped and handed to a customer, the bartender inserts it into a circular aperture and turns it through 360 degrees.
This aperture contains a small diamond glass cutter which scores around the neck of any bottle, 30mm from the cap.
It’s exceptionally difficult to break any bottle cleanly, so the effect that this scoring will have is that the bottle, held by the neck, will snap, when it is struck on a table top to make a weapon, in such a way that the potential attacker is left holding a very short, painfully jagged piece of glass.
Not only is this hard to hold and therefore pretty useless as a weapon, it also makes them look rather ridiculous.