"Dad's Baldness"

Little Johnny was eating breakfast one morning
and got to thinking about things. "Mommy, mommy,
why has daddy got so few hairs on his head?" he
asked his mother.

"He thinks a lot," replied his mother, pleased with
herself for coming up with a good answer to her
husband's baldness.

Or she was until Johnny thought for a second and
asked, "So why do you have so much hair?"