Celebrating Mother's Week: Moms-to-be are known for their nesting instinct in the weeks before baby is born. And about 18 years later, there's the moving-them-out-of-the-nest instinct, which finds Mom going through essentially the same behavior in the weeks before high school graduation. There's no explaining this behavior; just grab a brush and repaint the damn bathroom, OK? And that tub ain’t gonna regrout itself, you know.