"Ever wondered what happens when you play a film backwards? You get an entirely new film." Some examples:

Star Wars

A rather large moon-sized spaceship suddenly appears in the vast depths of space and, to prevent it from disappearing again, a nice young man called Luke extracts a bomb from its central chambers. The space station re-assembles a disintegrated planet, saving its occupants, and slowly begins to dismantle itself as a group of rebels become more and more disorganised. The young man goes home to his farm.

Titanic

An enormous iron ship surges up from the vast depths of the ocean in order to save a large number of people who are inexplicably, and somewhat foolishly, floundering in the water near an iceburg. It then kindly takes them back to Southampton.

The Lord of the Rings

A mentally challenged Hobbit overcomes his disability by retrieving his finger - and a golden ring - from the depths of a sinister volcano. They then travel through the countryside as we observe the journey of a band of adventurers who go around saving people by pulling swords out of them. The Hobbits spend the rest of their days in the peaceful idylls of the countryside.

Batman Begins

Bruce Wayne, playboy millionaire and defender of the people, shuns his role as the masked crusader "Batman" in favour of international travel after cleaning the city of a mysterious fog and receiving no thanks in the process.

The Matrix

After a long day of beating people up in videogames, neo gets a sleeping pill from a black guy in sunglasses so that he can wake up in time for his boring office job in the morning.

(Via GMSV.)