So my little brother and his roommate came to visit for Halloween weekend.
The first night they stayed over, Squee (the friendly cat) walked out from my roommate (codename) Rick and slept at my little brother's feet. I'm sure Lil Bro was slightly nervous about this, being eye-swellingly allergic to cats, but at least his feet were warm.
In any case, Rick walks out to see her cat sleeping with the guest and she makes and goes "Traitor!" Because Squee always sleeps with Rick. And if he doesn't sleep with Rick because she's not around, he sleeps with me.
And Squee looks back at her like "What? I do what I want; I'm a freaking cat."
So the moral of the story is, your cats may or may not sell you out for no discernible reason. Disheartening, isn't it?