Harry Potter & the Deathly Hallows Teaser Trailer - Unlike a typical teaser trailer this lasts for over 2 minutes. However, because the Harry Potter franchise is so successful, the producers can afford to brerak all the normal rules. This trailer was released 13 months before part 1, and 21 months before part 2.
The Dark Knight Teaser Trailer - This trailer follows the typical conventions of a teaser trailer, as it is only 54 seconds long, and shows no actual footage from the film, only audio.
Pirates of the Caribbean: On Stranger Tides Teaser Trailer - Unlike the other POTC teaser trailers, this contains no footage from the film, and was filmed only for the purpose of the trailer. Unlike many other teaser trailers, this is a mintue and a half long.
Up (Pixar) Teaser Trailer - As is the case with most Pixar trailers, this contains no actual footage from the film, instead the footage included has been created entirely for the teaser trailer. Like many teaser trailers, this is under a minute long.
