The document summarizes four movie trailers:
1) 500 Days of Summer establishes two main characters and shows the passing of days to develop their romantic connection. It subverts romantic comedy tropes while using familiar genre elements.
2) Harry Potter establishes the fantasy and adventure genres through elements like magic wands and broomsticks. It builds mystery and tension through dialogue, music, and fast editing of action clips.
3) Inception uses an unnerving score and mysterious shots to build intrigue around a worried character and distorted realities. It promotes Leonardo DiCaprio's involvement to draw audiences.
4) Paranormal Activity 3 presents itself as found footage to develop a sense of realism. It