Demonstrate Jokes

Those people are preparing peach gelato because they want to demonstrate their rights to freeze peach!
Americans were preparing peach gelatos, to demonstrate it's right to freeze peach!
“Stomach: I will now demonstrate a blue whale’s mating call.”
― Unknown
Why did the teacher use the evolution of Thor in viking mythology to teach both literature and Northern European history in her class?
She wanted to demonstrate using a Meta-Thor.