My kids invented a game and luckily I got to watch it. One of them would hide under a bin while the other one would mop. The bin was an egg and the one inside was a baby bird and the one mopping was the mommy or daddy bird.
Then the baby bird would pop out of it's shell and say, "mother,mother, here I am mother." And they would hug and kiss. They took turns doing this for awhile.
I am pretty sure this game was inspired by the book Are You My Mother? And I love it!