Classic: cutting doll hair.
I love to be reminded that people have full personalities even when they are barely begun. These kids certainly do, as do my karate peewees. I just follow their lead. They have their concerns & thoughts, and I only have to ask a follow-up question. I like seeing timelessness kid behavior: Little girls almost always cut their dolls' hair. I don't remember doing that (didn't have dolls): I cut my own hair when I was 5 (& still do). My mother was so appalled (& still is) that I blamed the little girl next door (Kathy Koons, I apologize!). To this day, my mother thinks of her as a sneak & terrible person (even though I long since 'fessed up).