(Vacuums and dusts.)
(spreads more dust around)
I always find it remarkable that when I cut into a wall, the space inside is not filled with dust. It's usually very clean.
I'm not sure which is more disappointing -- the fact that we can't have fun conversations about things like this anymore because the answer is just a quick web search away, or the fact that this dude managed to stretch a quick web search out to an entire video.