Startup Idea : Message Scroller

I want to message people with a scrolling message. I know it is old school, but it is handy. If your behind someone you can scroll a message that they can't read. Or if your in a group and don't feel like texting. It could also be used in stores to sell merchandise. It should like like an old school windows screen saver, where you got to chose scroll speed, font, and color. You should add number of scrolls and automatic delete of message once played.