Where do you think these actually came from?
(No googling—that would be cheating.)
P.S. Anyone who wants to know the answer can google it. But there were some great guesses in the comments. My favorite, from Frank:
I’ve got to go with “before the colon” in questionable social science papers, e.g:
“Don’t make me laugh: the effect of late-night comedy on fatal traffic accidents”
“Out of the jaws of victory: evidence of a hot hand in shark fishing”