Stelle cadenti - Moving Pictures, by Terry Pratchett (1990, UK)

Victor is a not-wizard by choice: he puts a big effort not to graduate...for the skin of his teeth, at the Unseen University in Ank morpork. But one day, as thousands of people, he is catched by the Holy Wood magic and there he goes. He meets Ginger, the Discworld version of Marilyn Monroe, Gaspode, the secretely speaking dog... and a different kind of magic. Mysteryous. And perhaps dangerous.