- Swim across the Pacific Ocean
- Clean the Augean stables in a single day, NO RIVERS
- Serve five terms as President of the United States
- Exorcise the Ghost of the Times
- Exceed the speed of light in a vacuum
- Summit K0, the secret tallest mountain
- Plumb the depths of the world's soul
- Walk on a planet other than Earth or Mars
- Pour soup from a big pot into a little bowl without spilling any
