Rest assured that what goes around comes around. Here's an example.
I'm pushing the kids buggy in the park. Dog poo gets stuck to one of the wheels, and leaves start sticking to it. Umpteenth time this has happened.
So I make my way to the pond in the park and wash the wheel/tyre in the water, just as I'm finishing I notice two bloody great big dogs and thier owner in her pristine white coat and black boots - looks like she doesn't clear crap up.
What happens next? The dogs start drinking the water from the pond where I washed the excrement off! LOL! How I laughed and s n ig g e r e d as I walked off.
I can imagine the owner having her face licked by those dogs and getting some of her own back.
THAT'S JUSTICE!