You cannot sell Limburger cheese on a Sunday.

The Law

Limburger cheese is notoriously pungent, emitting an odor that many liken to sweaty feet. During the era of blue laws, which mandated strict rest and polite behavior on Sundays, selling such an offensive-smelling item was deemed a nuisance to civilized society. Though blue laws have largely vanished, this dairy restriction is a lingering relic of historic Sunday etiquette.