Theo has door issues. Whenever I close a door behind me and he finds himself on the other side he will meow his high pitch, tiny sounding mew. He won't stop until I open the door. To his credit he will always then either rub up against me or start climbing my leg as if indicating he wasn't trying to annoy me as much as he really did miss me in the twenty seconds he couldn't actually see me.
If I leave a door slightly ajar Theo will try to push it open. Unfortunately he doesn't quite understand the concept of how a door functions so he will try and open it by pushing his paws through the open crack and just by occasionally accidentally brushing the wood will the door begin to open further.