Google's latest easter egg is a search for [let it snow] where it will begin snowing on the search results screen, so much so that the results will begin to be covered by the white flakes, making it impossible to see the results.
You can then use your mouse to clear away the snow to see the results, or you can hit the "defrost" button, which is converted from the search button.
Click here to see it in action.
Here is also a video:
I should note that this won't work on older browsers. Which is why some people are complaining.
Forum discussion at Google Web Search Help and Google+.
Image credit to ShutterStock for a snowflake image.

Comments:
Barry Schwartz
12/19/2011 02:17 pm
hack = easter egg
Eloi Casali
12/19/2011 02:17 pm
What's the hack ??
David Dalka
12/19/2011 02:27 pm
Wow, they've really hired alot of ex-Yahoo! employees now, haven't they?
Dave Eaves
12/19/2011 11:21 pm
I love it when google does stuff like this
sandeep kumar
12/21/2011 12:03 pm
this effect is awesome
Matthewjsteeples
12/24/2011 02:49 pm
What a cool little trick: http://dasteepsspeaks.blogspot.com/2011/12/let-it-snow.html