Google's Robots.txt Updated for Halloween (scroll to the end)
google.com
google.com
Clickable link: http://www.google.com/ (look closely at the 'e')
EDIT: Well, that sarcasm came round full circle. There's actually a gem in clicking the logo itself. Well played, Google.
$ wget -U "Kids" http://www.google.com/treats
--2009-10-31 07:00:37-- http://www.google.com/treats
Resolving www.google.com... 64.233.169.105, 64.233.169.106, 64.233.169.147, ...
Connecting to www.google.com|64.233.169.105|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2009-10-31 07:00:39 ERROR 404: Not Found.
Oh well.good job adding date to make it past the darn HN URL checker.