A book about a man who went round the USA, correcting the typos he found on signs - article about it \link{http://www.npr.org/templates/story/story.php?storyId=129086941&sc=fb&cc=fp\here}.
(I also loved, in the comments under the article, "It's be ions since I saw the word 'Ken' in a sentence" 
- do you think that was intentional?)