When will I learn -- you can’t trust a movie just because it’s preceded by Cinderella’s castle and a flirtatious little fairy? Michael and I saw Shrek a while ago. Cute enough. Elizabeth’s teacher (Mr. Billy) dressed as Shrek for Halloween. So we didn’t think much of letting the girls watch it when it came on TV recently. As usual, we kept an eye out for any scenes of unexpected violence and checked the girls for their reaction. Shrek cornered in a stadium? No problem. Shrek pummeling his adversaries before the townspeople? Hunky Dorey A giant, fire breathing dragon chasing Shrek and his donkey friend throughout a castle practically lighting their asses on fire? Just fine. No, the trouble began when the Princess walked through the forest and exchanged vocalizations with a beautiful blue bird. The Princess sang, the bird whistled. The Princess sang louder and the bird followed suit. Finally, the Princess unleashed her loudest caterwaul and the bird... exploded . The Princess ...