The only thing worse than all the junk mail stuffed in your mailbox is finding a card that's actually addressed to you, but is covered in mounds of glitter. The shiny stuff ends up all over your hands, your face, and your home, and it's all but impossible to clean up. So that's why a glitter bomb, courtesy of ShipYourEnemiesGlitter.com, is the perfect prank.
The site is pretty self-explanatory. You send them $10, give them an address, and sit back and wait. In a few weeks time your enemy will find a nondescript but non-threatening envelope in the mail which they won't realise is stuffed to the brim with glitter until it's too late. Once they pull out the letter inside the glitter bomb will be released, and you'll be left feeling a smug sense of satisfaction for anonymously striking back at your foes.