There is a cat at a relatives house that has sliced up my legs and feet a few times. So now I’m really nervous around her. Occasionally she will be sitting at the entrance to a hallway or flight of stairs. This means I have to change my plans and try that task later. But then I remembered the trusty laser pointer. If my passage is ever blocked I can just have her chase a red dot over to the other side of the room. Problem solved.