I went to visit my parents recently.
Their living room TV, a Panasonic standard def, CRT 32", had a weird problem.
At random times, the whole image was scrunched into a very thin horizontal line in the middle of the screen. Sound was still coming in fine.It was on all channels apparently. I checked all the connections , antenna, power , etc were all secure.
It would do this "line " thing for a few minutes and then go back to normal afterwards. Its happened both at day and nights randomly they say.
No changes to their entertainment setup(all they have is a rabbit ear antenna and a simple dvd player from 2000).