Subject: Quick study? 

A teacher stands in front of the students in her classroom with her
hand hidden behind her back.  She says she has something round, hard
and red in it.   Can anyone guess what it is?  One little girl guesses
it's a ball.  The teacher says, "No, it's an apple, but I like the way
you think."  A little while later, the teacher again stands with her
hand hidden behind her back and indicates she has something long, hard
and stiff in her hand.  A little boy guesses it's a stick and the
teacher says, "No, it's a ruler, but I like the way you think."  Just
then the class bad-boy jumps up with an evil grin on his face.  He
thrusts one of his hands deep into his pocket and says, "Teacher, I've
got my hand on something that is round, hard and it has a head on it!"
She blushes with embarrassment and begins to protest about obscene
remarks being made in the classroom.  The boy interrupts her and says,
"No, no teacher...it's a quarter, but I like the way you think!"
Lyle's Joke Boutique.