Google has finally went cool and hip with their custom 404, playing catch up to Twitter and the likes, creating their own Google Broken Robot.
Try it out, go to google.com/rustybrick.
Twitter has the fail whale, which we see way too often. I believe many other Twitter-like companies have these 404 pages that are fun and creative.
I am just surprised Google doesn't put a search box on these pages.
Here is a larger picture of the custom 404:
I apologize to the person who sent this news to me on Twitter yesterday, I cannot find their tweet to give them credit. :(
Forum discussion at Google Blogoscoped Forums.