Basically, I have been experiencing 2 kinds of it:

- The motion of falling lizards dropping by side view, but no traces of lizard's poop on the floor.

- Flatten objects in the middle of the road that I "accidentally saw" while turning my head during a bus ride, that looks like carcass of stray animal that has been ran over by cars.

The 2nd type that I've frequently "seen" always kills my mood or puts me into anxiety and fear because I get really depressed when I see dead stray animals in the middle of the road.

Speaking of that, my first actual encounter was seeing a dead cat by the road kerb with it's inner organs "vomiting" out of it's mouth after being ran over while I was still an elementary/primary school student. It traumatized me for a long time.

What is this I don't even know, yet it's provoking my mood into sadness?

Edit: I'll post it in another sub-section if this is the wrong place. :/