I thought of something like this based on license plates a while back. Drivers would send messages (kudos or kurses?) to a license plate's inbox. Anyone could

I thought of something like this based on license plates a while back. Drivers would send messages (kudos or kurses?) to a license plate's inbox. Anyone could check the inbox, but you'd have to know the plate. I think it'd have to do speech recognition though, because texting-while-driving would probably be irresponsible to encourage. I couldn't figure out how to make it practical or monetizable, but it'd be fun to have something to scream at while driving now and then :)