I have been perusing the US Patents library by searching on the new Google Patent Search.
I have got two cats and I never realised how cruel I was being to them because of my ignorance of their exercise requirements.
US Patent 5443036 Method of exercising a cat
A method for inducing cats to exercise consists of directing a beam of invisible light produced by a hand-held laser apparatus onto the floor or wall or other opaque surface in the vicinity of the cat, then moving the laser so as to cause the bright pattern of light to move in an irregular way fascinating to cats, and to any other animal with a chase instinct.
I have always used a piece of string or wool and got exactly the same effect.
Why don't you play my "Find The Stupid Patent Game" (pat pending) over this holiday period.
I have also updated my "Simply Google" page with the new patent search as well.