See that signpost up ahead? You've just entered… the "Ogrezone!" The "Beware of Ogre" sign that was posted in Shrek's (Mike Myers) swamp was altered in some way. Do you remember what he did to it? We do.
He added an S to the word "Ogre" so it would read "Beware of Ogres."
He also added the portrait he painted of the Princess.