Google celebrated September 7 as its birthday till 2005. In 2005 Google changed the date to September 27 to make it coincide with the announcement of the record number of pages that the search engine was indexing. Google's date confusion also extends to its date of incorporation. Google for quite some time on its corporate history page mentioned September 7, 1998 as its date of incorporation but that date too has now inexplicably changed to September 4. For its 15th birthday, Google has posted an interactive version of the pinata, a popular Mexican birthday party game. The purpose of the game is to hit the pinata (a decorated container usually made of paper or cloth and filled with candy or toys) and extract as many toffees as possible. A user gets 10 chances to strike the piñata with a stick controlled by the spacebar on a computer keyboard or by the mouse and by swiping on a touchscreen mobile device. Ref : http://ibnlive.in.com/news/google-celebrates-i