Treat the world like the napkin it is. Begin with the sleeves of your shirt and your shirt’s lower hem. If you haven’t got sleeves, your forearm will do just as well. Wipe the orange juice, the coffee, the syrupy crumbs of the pancake off in these places. For the foam from toothpaste and shaving cream, the shower curtain is perfect, or the side of the porcelain sink. If you find yourself eating a powdered jelly donut on public transit, your book or newspaper will wipe things clean; if you haven’t either, use the standing pole. Out of doors, press your mouth against a tree. Or into the grass. Or even the dirt underneath. Get down there, press your face in. Rub it around.