We had a cat that would do that. The girls called her a pyscho cat. I loved her. She was so dainty, tiny but when she was ticked you'd know it. She was in our room one night sitting on the dresser, she got this freaked out look, her eyes got real big as she was staring at the wall acrossed the room and growling. Didnt see a thing. I dont think we have ghost here really, my kids say we do. I think we might have one that passes thru every once in awhile. But anyway, that cat would do odd things.