Absurdity is an underrated phenomenon in comedy. The Zucker/Abrahams/Zucker trio realized its potensial, and put it to use in the best possible way in films like Airplane! and The Naked Gun. However, in the not equally subtle nor impressive teen/sex-trend in American comedy movies, intellectuality and absurdity have been substituted with profanity and banality. Enter the vivid (to say the least) imagination of Douglas Adams and his hugely successful novel "The Hitchhiker's Guide to the Galaxy", combine that with a talented and visually impressively creative British director, and you've got the basis for one of the most inventive and delightfully unpredictable sci-fi/fantasy movies in some time.
Martin Freeman (from the hit series The Office) makes the ideal ordinary hero, and the supporting cast is amusing (Sam Rockwell and Bill Nighy in particular). As opposed to other filmatizatons of big 20th century fantasy fiction over the past two years (The Lord of the Rings-trilogy notably), The Hitchhiker's Guide to the Galaxy is wise enough to not take itself too seriously and to know when to stop. This gives the film a spontaneity that makes it all a very untied and intuitive experience. Even though the annoying robot should've been sedated, The Hitchhiker's Guide to the Galaxy is perhaps the most enjoyable road-movie since Stagecoach.