Grey Hair

And why I have it.

MonkeyBoy has recently taken to rearranging all the chairs in the
house, then leaping joyously from one to another (he says it's because
the living room floor has turned to lava). Last night, Himself caught
him jumping from the wheeled, spinning computer chair onto an elderly,
wobbly chair with pointy, eye-level finials. Since repeated falls
haven't done much to deter the chimp child, Himself said, in his best
Serious Dad voice, "Stop that, it's dangerous! I don't want to see
you jumping on the chairs anymore."

Totally unphased, Mr. Cool-as-a-cucumber replied "Then don't watch, Dad."