The nine-year old grabs a box of tampons from the
shelf and carries it to the register for check-out.

The cashier asks, "Oh, these must be for your Mom,
huh.?"

The nine-year old shakes his head and replies,
"Nope, not for my Mom."

Cashier: "Well, they must be for your sister then?"

Nine-year old: "Nope, not for my sister either."

Cashier, curious now "If they're not for your Mom
and not for your sister, who are they for?"

The nine-year old says, "They're for my four-year
old brother."

Surprised, the cashier asks, "Your little brother
right here??"