The antigravity module is a really simple module that only have the start() function that return the url of the xkcd.com strip that louch all the "import antigravity" things.

So to understand the joke, go to http://xkcd.com/353/.

A better implementation is now available in Python SVN : http://svn.python.org/view/python/trunk/Lib/antigravity.py?rev=66902&view=markup