Dive Summary:

• Google's 2012 Halloween logo looks like a dreary street scene at first glance, but reveals various hauntings as the user plays with its interactive elements.
• The logo also has audio elements.
• Clicking on a black cat will make the ghosts disappear and bring up the search results for "Happy Halloween!"

From the article:

It’s Halloween, and Google’s got a special logo to celebrate the day. Click away to reveal ghosts of the not-so-scary kind to spell out Google! ...