Take a word from the phrase in the previous post and post a new phrase. Any word in the previous phrase can be used for the new phrase. For instance, "keep up the good work" could be followed by "keep your fingers crossed," "as good as gold" or "all in a day's work."
Also, any variation on a word is acceptable. "Flight of fancy" can be followed by "flew the coop" or "off to a flying start."
To Start: The game is afoot!