Boston compartmentalizes by neighborhood loyalty and transit line. Cambridge rooms fill with academics who've never crossed to Southie, while Allston hosts the students who'll be gone in four years. Jamaica Plain draws the artists. South End operates in its own bubble. Dorchester and Brookline add layers the tourist maps don't show. The comedy here navigates populations that share a metro but claim different cities entirely. Open mics become the rare space where all the neighborhoods sit together. The comics who honor each Boston without choosing sides find audiences across every T line.