Maple Leaf Mommy

Not a quote, as I usually go with for Monday Mutterings, but true none the less. I so remember doing this as a kid, and I now find my own girls playing the lava game. Having never shown it to them I have to wonder, where do kids come up with this stuff? How the heck did my brother and I come up with the game, way back when? Is pretending the floor is made of lava genetically bred into human children?