U.S. Patent on swinging a swing

United States Patent: 6,368,227

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.

This might be the most stupid thing I have ever encountered. Ever!
Thanks to Eske for showing me the way ;-)

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Hvad er 2 plus 2? (antispam spørgsmål...)