Oscar Isaac was completely unrecognizable in his Apocalypse costume during X-Men: Apocalypse. His suit wasn’t just extremely heavy, but all of the prosthetics and the makeup he had on made it an excruciating experience.

Isaac shared, during an interview, that his most frustrating moments during filming were when he desperately needed to cool down. He used to go in a tent with air condition between the scenes in order to get himself straight mentally. “I would do some acting and then go to my tent and try to breathe and not freak out that sweat was pouring into my ears and I couldn’t touch them. It was rough,” he admitted.