Leslie's Head

We are a very loud crew living above our neighbor Leslie. There are moments we try to hush a sound now and then but we are just plain loud. Just a moment ago, Eli was rolling a tube of quarters down his birdcage and they were landing on the red rug in the living roo. Eli asked me, "Is this hurting Leslie's head?" Why would he think this soft landing would be louder than him jumping off the sofa on the floor, shaking all of our living room contents?