"Upstairs Neighbor Has Been Dumping Their Cat Litter And Trash Out Of Their Window For What Seems To Be The Past Year Or So"

"I moved in only a few months ago. The other night I woke up to a noise by my window. I looked out and noticed this massive pile of cat litter. I've complained to the landlord but they haven't done anything yet."
Same here in northern Germany. People need each other and it shows.
Just walk across the bonnet.
$15
This where having a towbar comes in handy..... just reverse enough to dent their car.....
#8 walk over his car. Make sure to wear golf shoes or winter spikes.
#10 throw a cup of diesel into it. That should kill the mosquitos.
#11 Your neighbors money, not yours.