Every vehicle in my immediate family (mom, dad, brother, and myself) has a plastic or rubber rat in it. This is a Ballantine family tradition stemming from my childhood, in which my dad had a red rubber rat in his truck. It was the red rubber rat, who knows where it's at.
I don't know exactly what "it" is, but your vehicle must have a rubber rat, who knows where it's at. That's just all there is to it.