Slade: The moral of this story? Never make a deal with an inter-dimensional demon without a little protection.
"I never figured out the moral of Humpty Dumpty. All I could think of was, 'Don't sit on a wall if you're an egg.'"
"The moral of this story is not to concentrate really hard on old diaries and go back in time."
"Snow goons are bad news."
— Calvin, Calvin and Hobbes
"The weed of injecting gorillas with secret serum bears bitter fruit of dismemberment! A lesson for the ages."
"Draco dormiens nunquam titillandos (Never tickle a sleeping dragon)"
— Hogwarts motto, Harry Potter
Tweedle Dum & Tweedle Dee: There's a moral to it.
Alice: And it's a very good moral if you happen to be an oyster.
"You cannot reason with a vengeful ghost. Remember this. It will serve you well."
"Crazy aliens destroyed the Moon Kingdom! So we all need to do our part to make sure that crazy aliens don't destroy Earth! So, write letters to your military, and let them know that you support them in their fight against crazy aliens. They won't think you're weird at all! Sailor Moon says."
"If there's one thing children need to learn, it is the consequences of behaving rashly, and being forced to help a maniac blow up a building full of innocent people is a pretty strong deterrent."
"Dont feed the Yao Guai."
— Three Dog, Fallout 3
At first I thought this might be some preachy anti-American propaganda about not imposing your superior values onto others. However, as Superman went on and on and on about it, it became clear that there was no allegory or metaphor. The lesson being taught to children here really was that you should never shrink anyone. And more importantly, you should never get a job writing cartoons when your main hobbies are recreational drugs and head injuries.