Some of today`s rearview mirrors have screens connected to backup cameras and side view mirrors now feature lights for both turn signals and to indicate if there`s a driver nearby.
For me, if I see police lights in the rear-vision mirror in my car when I'm driving, I instantly get butterflies in my belly even if I've done nothing wrong!
I was sitting in my car, looking in the rearview mirror, trying to figure out which friend I could call to call in a bomb threat, so I didn't have to go back in the building.