Cats are into everything, they aren't loyal, and are selfish.
My cat is incredibly loyal to me, so much so that he is a little jerkface to anyone who comes to visit, hissing and swatting at them. My father describes the monster as a "one-person cat." When I come home from an extended time away he'll be quite clingy, and when we aren't in the same room he'll meow. Thankfully that wears off after a day or two!
Oh, and cats really aren't selfish either. Anyone who's had a dead mouse placed at their doorstep or a toy waiting for them at their beside when they wake up in the morning knows that cats can be quite generous!