Google Gravity: http://mrdoob.com/projects/chromeexperiments/google_gravity/

Go to www.Google.com and in the search field, type: do a barrel roll

Go to www.Google.com and in the search field, type: askew

Here is a quick youtube video of some fun in action: http://www.youtube.com/watch?v=ogdtESfAmG4

Here is a list of a bunch more fun from Google: http://en.wikipedia.org/wiki/List_of_Google’s_hoaxes_and_easter_eggs