Q: Is the earth flat? -> "Not controversial enough..." (nowadays, in 2019) ie. it does not fit the "surprisingly popular" definition because it isn't popular. T

Q: Is the earth flat? -> "Not controversial enough..." (nowadays, in 2019) ie. it does not fit the "surprisingly popular" definition because it isn't popular. There's just a few loudmouths who make it seem like that (combined with a bunch of jokers who joke about it). Hence you don't get many people who will argue most people will respond Yes. You could regard that as a flaw, I see it as a feature.