Here's the sentence I recently read in Margaret Mitchell's "Gone with the Wind":
"He was out of the office before you could say Jack Robinson".
The second part seems to be a kind of proverb. Well the meaning of this is actually clear, for it's easy to figure out of the passage. The question is where does it come from. I wonder if anyone knows true origin. I wonder if Jack Robinson sounds really that fast. I think there is a huge number of words in English that are short enough to describe the gap of time being extremely small. Then why it is still proposed saying this way? And who's that Jack Robinson after all?