Ugh! --in what insane asylum did someone decide it was good UI design to have a video that, not only starts playing, as soon as you scroll it into view. But als

Ugh! --in what insane asylum did someone decide it was good UI design to have a video that, not only starts playing, as soon as you scroll it into view. But also follows you down the screen, when you scroll past it, blocking your view of the rest of the page?