I've had one wicked smart cat. She opened drawers to get toys, opened doors to get good sleeping spots and had a wonderful routine for waking the lasy humans who didn't feed her on time (4am when the kibbles were no longer fresh).
Doozy Cat started by scratching on the wall to wake mom and dad. Mom and dad got a squirt bottle and weren't afraid to use it. Then Doozy started the wall scratching around a corner, where the evil water couldn't reach her. Doozy Cat then got banished from the bedroom, which she didn't care for at all. She stopped scratching and was allowed to return to her place on the bed. This is when her diabolic little mind went into overdrive, and she figured out the sure fire method of waking the folks. It started with knocking stuff off the dresser, one thing a time. First a watch, then a piece of jewelry, then then alarm clock. One after another, separated by just enough time that mom and dad had almost fallen back to sleep. If this didn't work, it was onto the window shade. Hook a claw underneath, pull it out and let it snap back to the window. Repeat as often as necessary, or until a book gets thrown at you. The final act was by far the best; mom and dad had finally fallen back to sleep, thinking the great Doozy Cat had been defeated. But Doozy had one final weapon in her arsenal. It was back onto the dresser, where the answering machine lived. The final, master stroke was pushing the buttons on the machine until it played back the messages. Those voices out of the dark never failed to wake mom and dad, and even if the language was rather colorful, no one was going back to sleep after that, and the Doozy cat got her breakfast.
She was an evil little monster at times, and I still miss her. I had her for almost twenty years, from 5 weeks old to 19 1/2.