Ash gets her foot tangles in my hair and starts kicking. I reach out and tickle her under arms, making her giggle. Her giggle makes me giggle. She realizes she made me giggle so she starts fake-laughing, and before you know it we're in a silly-noise-contest which turns into an all-out tickle-fight. Acouchi places her paw on my nose and gives me a look that clearly states: "Now, now. Calm down, children. It's bed time."
At least one of us a responsible adult.