Glitter is that special-effect annoying people add on cards, or things to make things look shiny. It's also a mess, and you can't quite get rid of it all easily. This guy decided to prank his dad because he knew he'd go through his mail.

This was the result:

Apparently, this isn't even the work of shipyourenemiesglitter.com. The site went viral last week because they'd ship your enemies glitter. This is the work of ruindays.com

The glitter bomb came with a spring-load to ensure glitter gets everywhere. Evil, perhaps?