On 2008-03-10, www.locoworks.com wrote:

My local coffee shop makes used grounds available for anyone to haul
away. If you spread it around the garden it greatly discourages cats
(they don't like the taste when they lick it off their paws). As a
beneficial side-effect, it kills snails and slugs and encourages
earthworms.

I'm tempted to try a gadget with a motion-sensor that triggers a
high-pitched sound (supposedly annoying to cats but inaudible to
humans).

Has anyone here tried one? Does it work?