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In page Teaser trailer:

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Later examples of major motion picture events that used teaser trailers to gain hype are The Lord of the Rings trilogy, the Star Wars prequels, and the Spider-Man films. The Da Vinci Code teaser trailer was released even before a single frame of the movie had been shot.[citation needed] Harry Potter and the Half-Blood Prince's teaser debuted three months before its intended release date, but its delay to July 15, 2009, expanded the gap to a year.