Adolf Hitler shark
Invented by Hubert J. Farnsworth
Purpose of invention To save the brain of Adolf Hitler
First appearance "A Clone of My Own"
"Everyone was in favor of saving Hitler's brain. But when you put it in the body of a great white shark. Ooo, suddenly you go too far!"
Professor Farnsworth [explaining the Adolf Hitler shark][source]

The Adolf Hitler shark was a creature created by Professor Hubert J. Farnsworth. Those at Mars University decided to save Hitler's brain. However, when Professor Farnsworth subsequently put Hitler's brain into the body of a great white shark, they thought he had gone too far. This is how they lured Professor Farnsworth to his surprise birthday party.