Razors props
The prop department in films is always made up of some of the most creative people you will ever meet. Their job is to read the script and help come up with concepts for all the props in the film. Doing a science fiction film means that most of it has to be improvised.
This is no easy task and making objects from scratch requires a lot of time and planning. Lightsabers for example are just old handles from vintage cameras. But the one that takes the cake is women’s razor blades being used as communicators by Obi-Wan and his master Qui-Gon Jinn in The Phantom Menace.