Your impression is NOT a myth. My Spider certainly responds to my current mood/state-of-mind.
For example, when I'm really drunk, the car handles much better, it can out-run any police car, take corners at amazing speeds, stop on a postage stamp, and when it passes a car full of women, they're all beautiful (especially very late in the evening). Plus it can go roughly 100km after the fuel gauge hits zero.
Unfortunately I think my neighbor is jealous of my fantastic car. When I come sliding into my driveway with brakes smoking at 3:00am he always yells at me about squealing my tires. I think he sneaks over to my house after I go to bed and puts scratches and dents in my car. I'm going to rig a video camera to catch him in the act.