My cat Bitey has been all over trying to figure out doors pretty much since I got him out of the cat shelter. He knows they stand between him and things he wants. He has been experimenting with trying to open them since pretty much day one, without luck. He will get up on his hind feet and use his front paws to try and do the magic with the door knob, but just hasn't worked it out.
Until now...
He opened the door to the laundry room tonight.
You may be facing your new evil overlord soon. A small black and white shelter cat who has puzzled out how to turn a door knob. I suggest you stock tuna based cat food as an offering to appease him, should he escape and visit...