Do you think you are pretty clever? Try out this site http://www.freerice.com/index.php
For every word you get right, the United Nations World Food Program will donate 10 grains of rice.
There are 50 word levels, but most people don't get past 48 - I got stuck around 47 before I decided to give it a rest (hey -we can only waste so much time! LOL)
So test your smarts and help out a great cause! How high could you get?