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If you’re a normal, well-adjusted individual, you are probably already in possession of one or more Gauss rifles (aka Coilguns). If you’re not, then you’re at the right website. Building one of these indispensable, magnetism-utilizing projectile tossers will bring minutes of educational destruction.

The photo is not quite a complete inventory of this project’s requirements… besides the items shown, you’ll also need balls of steel. Nine of them.

Make your own Gauss rifle
Wikipedia entry on Coilguns

(If this Gauss rifle is your cup of tea, you may also enjoy some of the other projects on the site, such as the magnetic ring launcher).