12 Movies That Were Ruined By One Dumb Decision

6. Starting Filming Without A Finished Script - Men In Black 3

There's some unwritten rules in movie-making; ensure the audience knows where they are; always turn the camera on; make sure as much of the plot is given away in the trailer. You know, obvious stuff. But, most important of all, is don't start shooting until you have a finished script. Promising films have totally unravelled because not only did the characters not know where the story was going, but neither did the film-makers.

This is particularly heinous for Men In Black 3, a film which heavily relies on time travel. Contrary to popular belief writing time travel is not easy and requires a full understanding of its internal logic. Men In Black 3 disregarded that to such an extent that filming had to actually be stopped half-way through so the logistics of the third act could be worked out. Yet, judging from the finished product, they didn't do a very good job of that; in the finale their self-imposed rules are twisted and totally broken to bring us to some form of resolution. With Will Smith back and Josh Brolin delivering a spot-on take of Tommy Lee Jones the film could have been an entertaining return to form for the franchise, but instead we left the cinema asking just why Agent K always met Agent J's father despite him needing the time travelled K to get him there in a world where Grandfather Paradoxes don't happen.