Following Antonio’s tutorial, you can trick Audacity in to opening an image file as a sound. Not only does this give you a sound wave which you can manipulate and bend to your will, but a lot of files sound pretty funky. A bit like if you put a Decepticon in a blender with a couple of R2 droids.

http://questionsomething.files.wordpress.com/2012/07/change-pitch-tiff-o-o5.jpg?w=600
http://questionsomething.files.wordpress.com/2012/07/change-speed-50-either-way.jpg?w=600