You shouldn't sneeze your boogers on people.
Greg is in a store waiting in line when he feels a sneeze approaching.
Greg wants to sneeze.
Greg sneezes into his elbow and tries to be quiet about it.
Greg sneezes on the back of the person in front of him in line, covering him in bodily fluids.
No one but Greg gets bodily fluids on him.
The person in front of Greg is completely disgusted and is angry at him.