Some years ago on a road trip with my then-girlfriend I played music on car’s stereo from my phone via aux cable. When, for some reason, I decided it was enough music I disconnected the phone. When I did that radio kicked in for a moment before I turned it off. My girlfriend couldn’t understand how come there still was music being played after I disconnected the phone from the cable. I told here there still was some music left in the cable. She believed me.