There is few I can add to this... we all seem to watch the same stuff. Then again I clicked on a vid 10 years ago - 'Car Horn vs Boat Horn' and the ilk still pop up in my recommended list. Regardless... here is my two cents.
Channel: OxfordUnion https://www.youtube.com/user/OxfordUnion
tl;dr: Basically an Oxbridge elitist AMA with fantastic guests and craic. Stanley Tucci being a highlight of late.
Channel: Cyriac https://www.youtube.com/channel/UC9Ntx- … 1nQ5rTUP2g
tl;dr: A twisted After Effects animator. Fantastic art style helped by his crazy mind. Known for his fractals and bizarre.
Channel: Georg Rockall - Schmidt https://www.youtube.com/channel/UCG5h8y … zPnh0dG0SA
tl;dr: nothing beats a satirical brit's take on the world.