Sooo it sounds like filming with James McAvoy on the set of his latest movie, Split, was a PRETtY BONKERS experience.

Split star Anya Taylor Joy and director M. Night Shyamalan revealed to MTV how they really filmed James McAvoy's amazing performance of personalities... and how he built Anya made of Cheetos?! Erm, what?!

HIT PLAY on the video below for all the behind-the-scenes goss...

-'Split is in cinemas now.'