Christoph Neimann illustrated the laws of physics as they apply to our daily lives. I can really relate to this one.
But back to Newton: he discovered that any two objects in the universe attract each other, and that this force is proportional to their mass. The Earth is heavier than the Moon, and therefore attracts our bodies with a much greater force. This explains why an empty refrigerator administrates a much smaller gravitational pull than, say, one that's stacked with 50 pounds of delicious leftovers.