My current cat isn't exactly the brightest crayon in the box. When she was little she would roll in the direction of whatever side you petted, and she would keep on rolling until she fell off of whatever it was she was lying on.
She lives with my parents, as I can't have pets at my apartment. Whenever I visit and stay the night, she'll wake me up if I'm sleeping on her side of the bed or if anything else is in her spot, and she won't let me sleep until her spot is clear.
My brother had a parakeet that could let itself out of its cage. A bald man was doing some work on the kitchen, and he escaped his cage and landed right on the guy's head where he walked around and chirped happily.
When I was little, we had a cat who loved toes. If you had bare feet, she'd come up and lick them.
When we were younger, my brother and I decided to train our guinea pig to be a "circus guinea pig." Ends up you cannot train a guinea pig to jump through a hoop.
My dad grew up in a house with a row of bricks about halfway up around the outside. Their cat would jump up on it and ring the doorbell to be let in.