D.L.F. had been wearing navy blue socks that had left lint all over his feet. I wiped the lint off with a damp cloth and let him run around while I searched for another pair of socks. By the time I was ready to put the new socks on, the soles of his feet were dirty again (guess it’s time to vacuum?). I told him, “Your feet are dirty.” He thought about it for a moment, and then said, “Dustbuster!” “You want me to use the dustbuster on your feet?” I asked. “Yeah!” he replied enthusiastically.