Watering the lawn while my child has the time of his life. That's multitasking (and free fun).
Little Abe: "I didn't like this last year. But it's so much fun now that I'm six years old! Yay!!!"<he goes running back towards the sprinkler>
Me: "Honey, you're only four years old."
Little Abe <stops>: "Haha, oh yeah." <runs back towards the sprinkler>
He really thinks he's much older than he is and he did not like running through the sprinkler last year.