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Tim made an auto-firing water cannon! He writes –

Once upon a time a subdivision swimming pool caused a minor problem, but to a problem solving geek a problem is a problem that needs an answer. So what were the problem and the solution? Well for all you legal types it is rabbits eating in my garden. So for the sake of this discussion we are talking about rabbits, however I must make a disclaimer that in motion detection and autofire if an unwitting person is tresspassing on my property and happens to walk into the field of fire… well we will refer to them as collateral damage…

Waterhobo – [via] Link.