https://youtu.be/Pl092whRLlI

Of the many things in 1989's "Back to to the Future 2" that should have happened by now (flying skateboards, anyone?) is the 19th incarnation of the movie "Jaws."

When Marty McFly flies in the souped-up DeLorean into the future -- to that way off date of Oct. 21, 2015 -- the movie theater in Hill Valley is showing "Jaws 19."

It's a gag-within-a-gag, poking fun at Hollywood's growing love affair with sequels and the fact that the movie itself was the first of two sequels.

To mark a future that never quite was (and to promote a 30th anniversary Blu-ray of the trilogy that started with "Back to the Future" in 1985), Universal releases this mock trailer for the 2015 shark movie. It has funny recaps of the 18 films that preceded it, including "Jaws 15" featuring the Russian shark Ivan Sharkovski and the love-flavored "Jaws 17: Fifty Scales of Gray."