What the hell are they thinking? These awful popups have actually genuinely achieved
a new low: even pop-unders and nefarious crap like that have an obvious way to dismiss the advert.
Apparently it's also OK to just plaster them all over the content so you can't even see it.
You go to the arrow at the bottom right and click "Turn Off Annotations". These are Annotations
in the "Ministry Of Love" sense. Oh, you have to do that for every video by the way. Unlike the
volume control, which of course persists across all videos.
Obviously, YouTube want you to hate them.