fartscroll.js

Everyone farts. And now your web pages can too.

1. Include "fartscroll.js" in your page.
2. Initialize the fartscroll plugin once the DOM has loaded:

// Fart every 400 pixels scrolled in the document
fartscroll(document); 

// Fart every 800 pixels scrolled in the document
fartscroll(document, 800);

More info at http://theonion.github.io/fartscroll.js/.