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If you go into some Japanese stores, the clerks have fist-sized orange balls behind the counter. No, the are not for sale. They're balls of paint that clerks throw at robbers so that police can more easily identify them:

The orange orbs you observed are called bohan yo kara boru (anticrime color balls). Basically, they're paint balls — plastic spheres filled with brightly colored liquid pigment. But unlike the fun-and-games variety, these balls are kept on hand in case of a stickup. The idea is to lob one after a robber and mark him to improve the chance of an arrest.

Link via Urlesque