Just in case you haven't seen this, New Zealand-born designer Grant Robinson has created a game named Guess-The-Google, based around the Google image search function - you simply view a montage of images then - yes - guess the keyword that drew them together. It sort of combines TV's Catchphrase with those Excel games that get passed around via email where you have to, for example, guess the football teams from pictures of their badges, or identify cult toys of the seventies.
The game, like Google Whacking, also formalises those absent-minded, bored moments we all have at work, where - faced with Google as our home page - we just start searching for the first thing that comes into our heads.