we had a REALLY smart cat a couple years ago. she'd be out exploring all day and we'd call her once from the porch and she's come running from down the street because she knew it was bedtime and we'd lock the doors. unfortunately the neighbords dog killed her though .

anywhoo we have 2 more cats now, but they would keep us up all night having their long epic judo matches. when we started letting them outside (the neighbors and their dog are gone) they stopped fighting and scratching everything up. I guess it's just not natural for a cat to live its whole life in the house.