Ghost(s)

Spirits can't directly touch us or harm us, not even evil spirits.

This is our world and they have no power over us. Their blows pass through us, they cannot draw blood. That scene in Ghost where Swayze punches his mate is impossible. Spirits can't do that.

However, sufficiently malevolent, with depths of rage to draw upon, they can spin spiritual power into force that cause inanimate objects to use. Example in the film are the subway ghost and Swayze himself, raging against his killers. His passion for Molly is not enough to generate this force, he has to tap his rage.