Homework.
Two: The very fact that yes, kindergarten Homework makes me unhappy. What happens when I...uh...I mean...the Offspring have algebra Homework? Three words: Go Ask Daddy. (Or, more likely: Get A Tutor.)
Three: The very fact that Son coming home with Homework is yet another reason in a long line of reasons that have recently inspired me to utter the dreaded tell-tale sign of age: “When I was a kid...”