Cast in Friendship. What is passion? The dictionary defines it as a strong feeling of enthusiasm, or an intense, driving emotion that can become obsessive. For a person, an object, or an activity—there’s no difference as far as our minds are concerned. A hundred billion nerve cells and a hundred trillion synapses are always at the ready. Neuroplasticity is what medical researchers call it. What does that have to do with cars? It’s very simple: you can love them, passionately.