Airplanes going over!!
Do you remember the magnification bubble that you placed over your screen to make the picture a little larger?
How about the tinted lens that you put over the screen to simulate a color image?The lens was usually tinted blue on top and green on the bottom, so if you were watching an outdoor scene, it would almost look like a color picture!
We got our first TV in 1951..it was a 17" Packard Bell, the biggest available then.
Hal