1. Armored Swans. At least they better be impossible. They are pissy enough, give them armor and they will be unstoppable!
2. Jousting Dandelions.
3. Lion Powered Generators.
4. Nuclear Powered Dinosaurs.
5. Dancing Backwards. You might think you can, but if you try you're still dancing forwards, just in the opposite direction.
6. Assassinating The Grim Reaper.
7. Obsessive/Compulsive Unicorns.