Another interesting weapon via Wired's Danger Room: the Koosh bullet. These rubber bullets can incapacitate, but are highly unlikely of actually breaking the skin.
"Lightfield has been selling these projectiles to law enforcement agencies and wildlife officials for years. Each round is filled with a soft projectile that resembles a koosh ball. They look like toys, because they're made by a Chinese toy factory. The best thing about them is that they aren't likely to kill someone even if they are fired at point blank range. They're so soft that they're almost incapable of penetrating the body."
As their marketing slogan says, "This may be the most intelligent way to defend your family against home intruders."
More from the Danger Room: