SAUGUS, Mass. -- A Saugus, Mass. family found themselves in the middle of a film fright. What they thought was going to be a G-rated movie ended up being a gory horror flick. Most parents try to keep a close eye on what their young children watch, making sure they don’t see anything too graphic. But, parents and kids headed to the new animated movie “Megamind” left a movie theatre in Revere, Mass. shocked. Children were at Showcase Cinemas to see aDreamworks cartoon in 3D, but instead they saw the horror movie Saw in 3D. Parents said when the previews...