Shadrach’s been hijacking Paul the postman daily to filter out Zak’s letters home. However his master plan to win Lisa’s heart goes horribly wrong when he forges a letter in Zak's name. The strategically placed letter, declaring that Zak has found another family in Chile, is found by an excited Sam who rips it open eagerly. When he reads the contents he furiously chucks it in the pigpen leaving Lisa to forage amongst the hogs to find it! As she reads a section of the mauled letter her suspicions are immediately aroused by the dodgy handwriting and inability to spell (thetvdb.com)