While most would immediately call the exterminator should they find rats in their abode (or school cafeteria thus shutting services down for two weeks) we prefer to pamper our rats. That way they feel suitably happy and don't gnaw on your face while you slumber.
Slartibartfast: "Perhaps I'm old and tired, but I think that the chances of finding out what's actually going on are so absurdly remote that the only thing to do is to say, 'Hang the sense of it,' and keep yourself busy. I'd much rather be happy than right any day.
Arthur: "And are you?"
Slartibartfast: "Ah, no. (laughs) Well, that's where it all falls down, of course."