The Jewish background is not that far from the black groove. Blacks are downtrodden, Jews are downtrodden, therefore they have something in common in that affliction. Being downtrodden often makes one more empathetic and sympathetic.
When you're starting out as an actor, you keep raising the stakes. First, you just want to be a character who comes on stage and gets a laugh or two and exits. Just five minutes on a stage, not even Broadway. But every time you say your little prayer at night, you place more demands.

