It (1927 movie)
This is one of the first examples of a "concept film". It is also one of the earliest examples of product placement. The concept of "It" is referred to throughout the movie. In one scene, Glyn appears as herself to define "It" for Mr. Waltham. Cosmopolitan Magazine is featured prominently in another scene. In this scene, the character Monty reads Glyn's story and introduces it to the audience.