Even though the RioCar is EOL. I can still wish, can't I?

I drove a company minivan today that had a sound system feature I hadn't seen before. When you park the car and remove the key, the radio keeps playing till the driver opens the door.

I suspect this is really some gimickery in the wiring of the car. Where the ignition sense is kept hot, and not a head unit feature. But it is a neat idea.