Wow, I wish I'd thought of this first - ShipYourEnemiesGlitter.com will (as suggested by the name) ship an envelope of glitter to someone at your request for $9.99 because, well, they’re terrible human beings just like you:
We've had enough so here's the deal: there's someone in your life right now who you fucking hate. Whether it be your shitty neighbour, a family member or that bitch Amy down the road who thinks it's cool to invite you to High Tea but not provide any weed.
So pay us money, provide an address anywhere in the world & we'll send them so much glitter in an envelope that they'll be finding that shit everywhere for weeks. We'll also include a note telling the person exactly why they're receiving this terrible gift. Hint: the glitter will be mixed in with the note thus increasing maximum spillage.
Check out the FAQs at the bottom of the page, which includes this:
My recipient got glitter in both eyeballs, is now blind, & would like to file charges. Help?
Wanna save a bunch of money and do it yourself? Amazon has lots of glitter, but you'll have to get your hands in it...)