Upside Down Animals And Monsters!:

Suggestion: Easier in Creative Mode. Steps: First, take or make an Anvil. Next, take a monster spawn egg of any animal or monster that you want upside down. Finally, put the egg in the first box of the Anvil, and name it exactly this name: Dinnerbone (don't forget capital D). Now take the egg out of the Anvil and spawn it. Your chosen Mob should have spawned upside down!