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You see in in movie trailers. The trailer will typically have a cold-opening and sometimes a "mini-trailer" before the movie title that last almost exactly 5 seconds. This is to at least expose you to the movie even if you don't watch the rest.

Examples (especially the first)

* https://www.youtube.com/watch?v=7BWWWQzTpNU

* https://www.youtube.com/watch?v=UVwFM2PukSE

* https://www.youtube.com/watch?v=xrzXIaTt99U



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