Against all odds

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. Well, that's where it all falls down, of course."

The Hitchhiker's Guide to the Galaxy, 2005