There is a moment in "Shrek" when the despicable Lord Farquaad has the Gingerbread Man tortured by dipping him into milk. This prepares us for another moment when Princess Fiona's singing voice is so piercing it causes jolly little bluebirds to explode; making the best of a bad situation, she fries their eggs. This is not your average family cartoon. "Shrek" is jolly and wicked, filled with sly in-jokes and yet somehow possessing a heart.