De Griezelbus (2005) NL

Shy, nerdy brightest schoolboy Onnoval has the gift of the gab and wit to convince encouraging class teacher De Vriend he's a budding author and a crush on tomboy Liselore. Initially she expects more macho confidence, like her ex, Gino, who heads a bully bunch picking worst on Onnoval, but holds back in case his story to be a werewolf might hold truth and because Liselore buys him off with a kiss. After a Halloween class lecture from horror author Nol van Paulo, Onnoval is assigned to pick the annual class trip: to a horror theme park. Convinced Lisolore actually dumped him for Gino, he accepts the revenge offered by devilish Ferluci, who can make come trough any horror story Onnoval writes. Unable to cancel the trip, he seeks a way out counseled by Nol, sort of assisted by Liselore, learning their adversary's anagram identity after outsmarting his hellish agent count Vlapono in the park.