During that entire week, the front of Fred's square had the facade of a TV set, so it looked as if he was on TV. On one of his questions each day, John would ask him a TV-related question and a different special effect was used (i.e. B&W, snowy picture, jumping horizontal hold, etc) to modify his image.
It's a good thing Wayland and Madame weren't on! She'd have been looking for the off switch! :-)
Rob