I love this! As you can see the comic above shows you just how cruel The Joker really is. In this scene the Joker runs up to some poor kid, excited to show his dad a perfect report card filled with A's, grabs it, and runs away! The little boy is left crying because his dad will never believe that he he went from D's to A's at school, or that it was actually stolen from him. The Joker laughs at the fact he made the kid cry as he runs away.
The Joker is obviously a major prick, but this is freakin' hilarious! I hope you enjoyed it.