Legendary director Steven Spielberg has a big rule movie stars must adhere to when working on his films – and it’s left some fans amazed.

The veteran Hollywood pro boasts an illustrious career, having been at the helm of wildly successful films including 1975’s Jaws, 1981’s Raiders of the Lost Ark, 1982’s E.T. the Extra-Terrestrial, as well as Schindler’s List and Jurassic Park, both released in 1993, and many more.

Many of his films have been critically acclaimed, as well as proving…