Electronic Spider Deterrent

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Plug this into a socket in a room where you tend to get spiders and forget about it. It will emit an electronic noise which is silent to humans but to the local spiders it's like listening to Jedward on repeat. I'm not sure what type of music spiders DO like (perhaps they're more into classical) but it's not this so the idea is they give your home a swerve. It's actually pretty humane in that it doesn't kill the spiders, it just makes them not want to set up home with you. And if you don't like your neighbours, it could be a sneaky added bonus...