5. "Gravity knife" means any knife has blade which is released from the handle or sheath thereof by the force of gravity of the application of centrifugal force which, when released, is locked in place by means of a button, spring, lever, or other device. [Note: In NYC, and potentially in other NY jurisdictions, this definition is construed to apply to ANY folding knife with a blade that locks open. ]
Remind me not to move to NY...