Car-aoke
I had a horrible great idea today while driving by a defunct Sonic style restaurant today. Karaoke meets the drive-in movie. Pull up in your car and you are greeted with a flat screen tv and some ordering process. Once completed, you get wireless microphones for everyone in the car and a Japanese karaoke remote that let’s you order songs on the unit. Queue up some songs, tune the radio to your personal station, and start rocking the Prius!
My gut says that this would be a complete failure as a business, so someone will probably try some variant of it with great success.