Useless Mutants: The Amazing Punctuationman!
Alien: Time for earth to pay for it's meddling ways!
Chicken hero: Wait! "It's" is a contraction of "It is"! "its" is the possessive!
For the truly dedicated: Join the Typo Eradication Advancement League. Seriously. Found at greattypohunt.com.
For much fun, read their book “The Great Typo Hunt,” wherein two guys went across the country with markers and white-out and such, changing incorrect signs and other materials. Beautiful thing.