Yes, I know it has been all over the net today, but for those who missed it..
1) Go to google.com (or .au if that's your thing)
2) Click 'insert coin'
3) Nostalgic awesomeness
While Google has removed the Pacman heading, it can still always be found at http://www.google.com.au/pacman/ (http://www.google.com.au/pacman/)