4-panel comic by War and Peas. Panel 1: A grey cat teacher stands at a desk with a pointer, lecturing a class of cats. "When the human awakes in the morning, it is very important to greet them." Panel 2: A student raises a paw. "Yes, Todd?" Todd asks, "How do we greet them?" Panel 3: The teacher nods approvingly. "Excellent question." Panel 4: The teacher points to a chalkboard diagram showing a cat presenting its backside to a stick-figure human. "With our buttholes."