Ship Your Enemies Glitter is an anonymous $10 (Australian, ~$8 US) service that sends the enemy of your choice (anywhere in the world) an envelope that will launch glitter everywhere when opened. Sure you could send the same thing yourself for cheaper, but that might be TRACEABLE. This is no time to find out your enemy is also an amateur detective. Plus, don't forget you can still anonymously send a box of horse shit too. You know how many boxes of shit I got after posting that on Geekologie? TENS. Way too many to eat in one sitting.
Thanks to Christian, who tried to glitter bomb email me but my spam filter caught it.