¡Agua, Agua, Agua…veinticinco centavos! ¡Coco, Coco, Coco…veinticinco centavos! ¡Helado, Helado…veinticinco centavos…Helado! The vendors on the buses have a regular rhythm and cadence here, and I don’t know what would happen if one of them was to break with tradition.