I've got a big-ass outdoor cat named Steve, who is a bit of a dick, but also a genius (think Good Will Hunting). Whenever he is outside and wants to come in he picks at the screen on the window of whatever room we are in.

What he did that surprised me the most though was one time when he wanted to go outside. I was in the kitchen making dinner and he started meowing at me so I followed him to the door. I felt like being a pain in the ass and kept telling him "I don't know what you want steve!"

At one point it got to "OH! You want to go outside? Fuck. I forgot how to open the door..."

Sure as shit, the second I said it, he stood up on his hind legs and started pawing at the doorknob as though he was trying to grip and turn it. Bricks were shat.