Tickertape by Tim Meek of Peterborough will allow you to use your computer as all all-purpose message machine.
Type in whatever terms of endearment, advertising slogan or insult you like and the computer will display it as a moving band scrolling across the screen from right to left.
The message must be no longer than 256 characters and will appear in double-height Mode 7 text.
If you make a mistake in typing your message, you can press ESCAPE to alter it.