This motion-sensing sprinkler will scare the neighborhood cats (and other wildlife) out of the garden. Great gift for gardeners (or non-gardening grumps) living near a feral cat colony or an indoor/outdoor cat (or three).
While it startles the cats, it's effective, humane, and good for the earth. Not too shabby. (And it never hurts for a cat person to suck up to their neighbors a little bit.)
And now, a cheesy Scarecrow commercial found on Youtube.