They drag you down to their level. Mothers of teens know why some animals eat their young. Children seldom misquote you. In fact, they usually repeat word for word what you shouldn't have said. Then you spend the next 16 years telling them to sit down and shut-up.
Insanity is hereditary.
You get it from your kids. I love to give homemade gifts. Children are natural mimics who act like their parents, despite every effort to teach them good manners. Cleaning your house while your kids are still growing is like shoveling the drive before it has stopped snowing. Children will soon forget your presents.