“You can really learn something about a person when he’s put into circumstances in which civilized values place his own identity, even his very being, in jeopardy… I often think: How would a friend with whom you’ve drunk a lot of vodka and had a lot of fun respond when one morning you plant yourself on his doorstep and say, ‘Hide me. I’m being chased by the Nazis.'” ~Roman Polanski
Polanski’s mother died at Auschwitz, his father barely survived imprisonment at Mauthausen–Gusen concentration camp. Polanski himself survived by assuming a new name and hiding with a Catholic family for the duration of the war.
This was not just an idle contemplation for him.