We previously saw The Slow Mo Guys demonstrate what happens when you jump on a trampoline littered with 1,000 mousetraps. They are back again to explain how our old CRT TVs worked. They slow it down to 380,000 frames per second and you can see the electron beam slowly scanning its way across the screen, top to bottom and left to right.
Watch the video to watch the amazing effect and to learn what causes it.
