Maine
You may not step out of a plane in flight.
Indiana
Bathing is prohibited during the winter.
Massachusetts
You may not, at any time take a crap on your neighbour.
Washington
A law to reduce crime states: "It is mandatory for a motorist with criminal intentions to stop at the city limits and telephone the chief of police as he is entering the town".

Those are the most stupidest laws I've ever heard of.