This morning, he followed me into the bathroom like he does. He immediately decided he didn't really want to be in there (like he also does) and started scratching at the door. Then he jumped and swatted at the door knob a few times. Sometimes I play with him by swatting at him while he jumps, but this was different. He looked like he was reaching specifically for the knob, but he wasn't sure what to do with his paws. This cat is too smart for his own good. When I brought him home as a kitten, he figured out how to open unlatched doors pretty quickly, so I wouldn't be exactly surprised if he eventually worked out door knobs. o.O