Google's Top 17 Easter Eggs, Gags, and Hoaxes By Tom Spring

Adding It Up With Google Calculator
Thanks to Google Calculator, you can use the Google search box for serious number crunching--anything from converting currency to solving advanced math equations. But things don't always add up the way you think they will with Google Calculator. Try searching for "answer to life the universe and everything," "number of horns on a unicorn," or "once in a blue moon" for unexpected computations.