Google has always had a lot of fun with holidays. Their graphic artists do a great job of adorning the normal Google logo with special treatments, such as adding iconic Irish symbols on St. Patrick's Day.
But today they've taken it beyond anything you'd have imagined:
Yup, that's right, you don't even see the word Google... Wait a minute, yes you do: spelled out in Morse code!
This is actually pretty brave. Google will probably scare a lot of people with this move. People will land on the page and either think that Google has been defaced or they've landed on a phishing site. It'll be interesting to see if they stick with it for a full 24 hours.