The Wilderness Downtown: an Arcade Fire interactive music video.

This is, without a doubt, one of the coolest music videos (if you can even call it that) you've ever seen.

Wildernessdowntown
The Wilderness Downtown is an interactive video/music/software mashup by Chris Milk, featuring We Used To Wait by Arcade Fire. You start by entering in the street address of where you grew up, and go from there. 

I won't give anything away. Give it a shot and see for yourself: http://thewildernessdowntown.com/