My cat has too many...
She likes to watch people when she pees in her litterbox. Literally. She just sort of half closes her eyes and stares at you. And she does this a lot when we're in the middle of cooking for some reason.
She licks the edges of her kitten bed, I'm not even sure why. We got her it when she was small, and she's just grown into the habit of almost eating it every time she goes to sleep on it.
Because she has a seriously unhealthy obsession with bottlecaps, she hides them all over the house and gets almost stroppy when you try to clean them. My mum binned about five the other day, and the cat walked over to where they used to be, yowled and then ran into all the other rooms crying because she couldn't find them...
There's loads more, but I probably can't list them all. xD