The Avatar actor was horrified by the 1965 creepfest Two on a Guillotine.

But what was the first film to have the actor holding his own breath in terror?

“I believe Cesar Romero is in it.

Stephen Lang; Two on a Guillotine

Stephen Lang, and Connie Stevens in ‘Two on a Guillotine’.David Livingston/Getty Images; Everett Collection

But that scared the living s out of me.

I was in a movie theater when I saw it.

I couldn’t really leave, you know?”

“I don’t go to see horror movies, they scare me,” confesses Lang.

It’s an extraordinary movie.

Watch the trailer forTwo on a Guillotineabove.