Ominous?
I'm following a lot of research into very low frequency signals from earth movements. And giving thought to how animals (including humans) perceive them. Been curious about this since my uncle's neighborhood was shook by - in my opinion - the collapse of a cave under the area. All the neighbors described different sensations. They all had immediate thoughts.
"Is that a racoon in the attic?"
"What fell in the basement?"
"Was that a car wreck?"
What was your first thought?