People
Anytime a person goes into a delicatessen and orders a pastrami on white bread, somewhere a Jew dies.
— Milton Berle

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
This is a deli joke played as a dramatic curse. The speaker pretends that choosing a certain sandwich bread is so wrong that it causes a death somewhere in a community. It's dark, exaggerated humour about food tradition, built on absurd cause and effect.
Context reviewed