On my version of Due volte Giuda is an interview with Herbert Fux, who talks about his work with Kinski. He tells a story about a scene, where Kinski had to strangle (!!!) him.
Fux was frightened and told the director, that Kinski should perform this scene with a puppet or whatever and secretely left the setting and headed for a taxi. Suddenly KInski's head appeared in a roof-window. He shouted after Fux:
"DU FEIGES SCHWEIN!" (You cowardly pig!)
Fux told the taxi driver to leave as fast as possible...