Typo vigilantes

This is fantastic!

Jeff Deck and Benjamin D. Herson, both 30, "took it upon themselves to correct public typos during a three-month road trip across the country...[they] drove across the country in the spring of 2008 armed with sharpies, pens and whiteout, correcting spelling, removing surplus apostrophes and untangling subject-verb disagreement on signs outside stores, gas stations, parks and public buildings."