At any time, in any location, under any circumstances, if there’s a human present then that’s the scariest motherfucker in the woods. This guy has clearly never bumped into a grizzly bear momma, a moose in rut, a hippo, or loads of other animals. Personally, I'm not even worried about AI itself, I'm worried about the people wielding it. MBAs are the scariest monsters in the woods.
I guess bacteria and viruses might have a stronger claim for being the 'scariest monster' though. I don't think there's a strong 'living' contender for wiping out humanity apart from those. (Viruses is a bit debatable on the 'living' part though).