What happens if someone blows shofar when Rosh Hashanah falls on Shabbos? Has he fulfilled the mitzvah—or did Chazal uproot it entirely? A lomdishe exploration of עקירת דבר מן התורה and מצוה הבאה בעבירה, together with fascinating and heartbreaking shailos that arose in the Kovno Ghetto and during the COVID pandemic.