Even friendly cats are assholes some of the time. At one point in college, I stayed in a friend's off campus apartment for a few days. (I was back to school early after a break, and they didn't let you back into the dorms before the appointed time.) I slept on their couch, and his roommate's cat, which was otherwise friendly, woke me up at 5 AM by standing on my chest and poking my stomach with its claws. The same cat also yowled intolerably whenever anyone was in the bathroom, because it had a deep-seated, psychotic NEED to know what was going on in there.