Jim Carrey's latest director is convinced the funnyman is made of rubber after watching him fall 20 feet (six metres) onto his head only to get up as if nothing had happened.

FUN WITH DICK + JANE director Dean Parisot feared he'd killed the actor when he lost his grip on a ceiling prop during a robbery scene and plummeted to the ground below.

He says, "Somehow he hung up there a little too long, holding onto a piece of a set, and when he fell it looked like he landed on his head.

"He's so surprisingly agile. At first I said, 'Jim please don't do that because if I kill you on the set it's really bad.' Eventually what I discovered is he's just made of rubber.

"He fell, like, 20 feet off the ceiling, looked like he landed on his head and then popped up again. He has this incredible connection with his body."