Scarecrow Motion Activated Sprinkler. What an awesomely humane and yet effective way to keep pests like birds, unwanted wildlife and such off your turf. It senses the intruder and then sprays them with water. Heh! $62.95.
The Scarecrow is the smartest scarecrow ever invented. When it sees an intruder, it instantly sprays the trespasser with water under full garden hose pressure. It is completely harmless but extremely effective. The effect is both startling and immediate! Animals quickly get out of the area and avoid it in the future. Scarecrow protects day and night for up to 6 months (or 3000+ activations) on one 9 volt battery.