One day, a teacher was testing the students' intelligence. "Okay class, I
have something behind my back which is rectangular, small and black. What
is it," she asked. "A chalkboard eraser," the class responded. "Yes, very
good. That shows you're thinking. Now, I've got something else behind my back
which is larger than the eraser, rectangular, and made of paper." "A book,"
said one small boy. "Very good Johnny, that shows you're thinking." Then
Dirty Ernie jumped to his feet, stuck his hand in his pocket and said, "I've
got something in my hand which is long, stiff, and has a bright pink tip!"
"Ernie! You dirty little boy," shrieked the teacher. Said Ernie: "Naw,
it's just my pencil, but it shows you're thinking!"