M. Night Shyamalan revealed that when he made Split, he didn't tell Universal Studios that he had put Bruce Willis in it.

M. Night Shyamalan is known to be a genius with a camera. His storytelling is famously thorough and immersive, gripping the attention of his audience and making the world around him disappear. Nothing demonstrates this better than the Unbreakable series. Starting in 2000 with Unbreakable, he created an immersive world that had a rocky start.

What many may not know, however, is that when the second film in the series, Split, was made, Shyamalan did not tell anyone that there would be a sequel. The way he managed to get the rights to his character and reveal the information to the studio was quite interesting to say the least.

Towards the end of 2016's Split, Bruce Willis' David Dunn makes a famous cameo and establishes that the film is set in the same universe as 2000's Unbreakable. This was not mentioned anywhere during the film's marketing stages, and fans who had seen the first film were forced to put the pieces together for the world.