"Note: When a dog relieves itself, it does so down. So does a horse. And so do humans, apparently. To test this last thought, I approached a man in a squatter: "Does it go down?" I asked. "What?" he said between droppings. "Your waste. Does it drop down or up?" He shrugged. "Down, you mad bugger. Now lose yourself!" I'm currently writing a paper on this to colleagues."

Pérola da McSweeney's: Sir Isaac Newton's Notes, Before the Discovery of Gravity.