Nothing says "get off my lawn" like being pelted with 34 paintballs in one second by an automated turret. It's not the most pleasant thing in the world, but the message is loud and clear. And now you can set up just such a defense system with the Paintball Turret System.
Sure, with a rate of fire of 34 paintballs per second this isn't the cheapest thing to run in the world, but it's just plain awesome. You'll need to make it yourself as well, since its not for sale, but Inventgeek has the instructions on their site. The materials will set you back between $500 and $1100, and it'll take upwards of 30 hours to complete, but come on. It'll be totally worth it in the end.