Thankfully my kitties aren't that brilliant (sorry, little guys, I love you!), except for Ginza, and I've mentioned what he's done before. He can flush the toilet (just for fun), he can turn the faucet so he can play with the water (round knob not lever). He can open all the kitchen cabinets, so we've had to install locks. Once I caught him doing it with the other 3 cohorts lined up behind him ready to get into the cabinets after he opened them.
At 3 mths old he made us aware of how smart he was, when he opened our bedroom door (round knob too). When you play with him, you can tell he's trying to figure out your next move, and that he's thinking.
He's now trying to figure out how to open the front door, by staring at me when I'm doing it, then trying it out right afterwards. :roll: :lol: