Method of swinging on a swing
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
Believe it or not, the above paragraph is the abstract of a US patent. 🙂
And if you want more, here is a list of crazy patents.
Now anyone out there on methods to climb a bus?