You can't force a good grade with Art

(heard after church last Sunday, at the dedication of the refurbished children's playground at the back of the church property)

A high schooler decided, after finishing a test, that he probably didn't do very well on it. So, at the bottom of the page, he drew a duck.
Then a gun pointed at the duck.
With the words, "If you don't give me a good grade, the duck gets it."

The teacher graded the test, and as expected, the grade was a low one.
When the boy got his paper back, he noticed an addition to his drawing:

The teacher had written, "I don't negotiate with terrorists!"
and had drawn a bullet coming from the gun and through the duck's head.