Mother of a bright kid visits his class during Open School Week. Teacher praises the kid to the skies, then invites Mom to observe his study habits through a one-way mirror in the classroom. She watches the kid studying his schoolbooks intently. About every 10 or 15 seconds, he sticks his index finger in his mouth, then taps the finger on his brow.

When the kid returns home that day, Mom says she's very proud of his good grades, etc. But, she wonders, "Why do you always stick your finger in your mouth and then tap your brow?"

"I'm following your advice," the little boy replies.
"What advice?" asks Mom.

"The other night I was passing by your bedroom door. I heard you say to Daddy, 'Make the head wet, it'll go in better.' "