What's the best way to deal with your enemies? GLITTER

A company based in America has come up with an ingenious way to get back at people you don't like - glitter. No, not that horrible Mariah Carey movie (although would be a fitting punishment too) - actual glitter.
For the fee of $9.99 (€8.46), Ship Your Enemies Glitter will "send them so much glitter in an envelope that they'll be finding that shit everywhere for weeks".