After the Simpsons receive a large idol head of Xtapolapocetl, the Olmec god of war, as a reward from Burns:
Marge: The moral of this story is a good deed is its own reward. Bart: Hey, we got a reward. The head is cool! Marge: Well then... I guess the moral is no good deed goes unrewarded. Homer: Wait a minute! If I hadn't written that nasty letter, we wouldn't have gotten anything! Marge: Well... then I guess the moral is the squeaky wheel gets the grease. Lisa: Perhaps there is no moral to this story. Homer: Exactly! It's just a bunch of stuff that happened.
