My four-year-old was brushing my hair while I worked on the computer. He started bringing in all kinds of hair clips, combs, and brushes so he could make me look "perfect." My mom was staying with us at the time, and he grabbed her hair brush too.
"We can't use that," I told him. "It's Grandma's."
"It's okay," he told me. "You won't get wrinkles."