I ran a quick errand today and I heard a tiny voice in the next aisle saying “No! I am the adult now! We are done shopping. Get in the car, now!” The voice’s owner came around the corner. It belonged to a three year old girl. Her mom was ignoring the demands and finishing her shopping, at least.
I guess declaring yourself an adult works about as well as declaring yourself a child again. Or a cat. Or an airplane.