I bought one of these in the supermarket today and the cats all seem to enjoy chasing the little light all over the floor. You have to be careful not to let the light shine in their eyes, but if you keep the thing pointed down onto the floor the cats will chase all over the place trying to catch the light. We've had a lot of fun this evening, Henry is tired out! I just wondered if any other cat slaves have used these laser lights to amuse their owners?