Thanks Ponder, but it wasn't what I was thinking of, I'll stumble across it again somewhere.
It's like; You've ran out of butter when you've just made toast - Do Your Work!
Your trapped in the lift with the world's most boring person - Do Your Work!
Can't find a matching pair of socks? - Do Your Work!
That sort of thing, I'm joking but I do love it, someone else must know where it comes from, hopefully.