Mountains of Mouthness is an interactive experiment created by Magnus Östergren and produced by Goo Technologies that features two mountains yelling tweets at each other. Users need only tweet to the @MoMouthness Twitter account or use the #mouthness hashtag, and the mountains will eventually belt it out.
The point to all of this it to make you the visitor write a tweet using the @MoMouthness or #mouthness and your tweet will be picked up and converted by a text-to-speech engine, then loudly recited by one of the mountains in realtime.
Users can also visit the mountains using a smartphone to experience a 360-degree virtual-reality world.
Thanks, Scott Devaney!