My 1010 bookmarklet is down, so I'll post this here.

In London they've come up with a new "tangible" interface, psychologically similar to the fly in the urinal interface. In order to encourage people to not put their gum under tables, on the ground, etc... posters featuring a grid of "celebrities" are being deployed with the message: "Who deserves your gum?" An astonishing $265M is spent every year in the UK cleaning up gum, which this solution hopes to cut into. Perhaps this could be used to replace Gallup polls.

BBC NEWS | England | London | Celebrities used as gum targets