Do you hear what I hear?

There are many radio stations to listen to, plus satellite, plus MP3 players, plus CDs, and more while driving in your car. Tonight I happened to be listening to the radio and looked back to see the girl driving behind me dancing around and singing. That's not the unusual part. Though I listen to 2 of the top 4 radio stations in this market and have for as long as I can remember, I have never caught someone listening to the same station as me... This time, though, I was able to match her singing (or the movement of her mouth anyway) and bobbing to the song on my radio. That's a first for me. Nothing that notable, but a first nonetheless.

Have you caught this before?