"Watching games"
I really liked this newsletter post from Heather Flowers about the kind of YouTube that provides a simulation or "game" for people to watch and comment on - marble rolls are a big one. I also recognize this kind of behavior in the audience for the League of Pigs channel, and in the horse race tests fad on (regrettably) twitter.
Anyway, It's an interesting topic to think about!! I recommend you check out Heather's post and then go watch some of these videos yourself. This is as good a place to start as any.