I'm thinking of those message boards where a [red] digital message marches right-to-left across a long, narrow, black screen.

So many times a brief message in my back window would come in very handy:

-If I'm being tail-gated: "Back-Off!"
-If a turn signal is left on: "Your flasher is on..."
-If I'm a bad boy: "Sorry about that!"
-If I win a street-race: "See Ya!"
-If someone ticks me off: "@#$%^&*&^%$#@#$%^&*+!"
-A pretty woman pulls in behind me: "Hello-o-o-o-o..."

You could pre-program a bunch of these messages, and hit the appropriate button to launch a timely message. Anyone ever seen this in a car?

With the time it took to type this, I'm already thinking this isn't gonna fly. What say you?

 

Yes I have seen these but I have no idea where I saw them or where you'd look.

 

I saw one at Sam's Wholesale Wharehouse. That would be neat.