How old is Grandpa?

[davedove]

If the TV reception was bad, you could rotate the antenna and improve the reception.

In my house, if someone walked up to the tv the reception cleared up. Of course, if they sat down the picture blurred again.

We had an old set that was starting to go bad. For a while, when the image blurred, you could stomp on the floor and the picture would clear.

[Cawdorian]

If that didn't work you could always give it a good whack on the top or side.