A Man, A Plan And A Sharpie: 'The Great Typo Hunt' : NPR: "Incensed by a 'no tresspassing' sign, Jeff Deck launched a cross-country trip to right grammatical wrongs.
He enlisted a friend, Benjamin D. Herson, and together they got to work erasing errant quotation marks, rectifying misspellings and cutting unnecessary possessive apostrophes.
The Great Typo Hunt is the story of their crusade.
In 2 1/2 months, Herson and Deck traveled the perimeter of the country, exploring towns and cities in search of typos. They found 437 typos and were able to correct more than half of them."