In an attempt to make the often overused and undermaintained portable toilets not the worst part of a music festival in Argentina, the organizers decided to make a bank of stalls one of the musical acts.
So they wired up the johns with lights and sounds that were all synced to each other, and whenever someone entered a stall, it would come to life and add its own tune and samples to the overall mix. Think of a DJ layering a bunch of songs together, but instead of using a couple of turntables, the mix is assembled as revelers attempt to rid their bodies of awful carnival food. Now if there was only a way to mask the smell as well. [YouTube via DamnGeeky]