Overscroll.js, is a small javascript library, giving you the ability to peak and show small easter eggs when the screen is scrolled beyond the height of the window. (It's a touch based ios/osx thing)
Overscroll has been tested in the latest stable builds of Safari and Chrome (Chrome has removed this as of version 40)... IE & Firefox don't really have the "overscroll" zones, so they won't work. Its just for fun... so not the end of the world ;)
