If I were God, Ok, not necessarily God, at least an Elf I would devise a lovely scheme for all those wonderful people who can’t seem to keep their saliva trapped shut.
How about this? Who ever, irrespective of age, cast, creed, gender, status, or education spits out on the road, the spit instantly bounces back on their face. “Phucchhak.” Not once or twice but every time.
Sounds disgusting? But I am only reminding you of Newton’s 3rd law - nature is governed by the rule “Every action has an equal and opposite reaction”
The rubber ball hits the wall.
I love physics!