Loophole Abuse/Theatre

Examples of in  include:

"Ain't no law that says third line's gotta be different at all. I said there ain't no law that says third line's gotta be different at all. ''No, there ain't no law that says third line's gotta be different at all."
 * For quite a while Spider-Man: Turn Off the Dark exploited a longstanding critic tradition of not releasing a review until after opening night by labeling all of their productions as "dress rehearsals"—despite selling tickets for them to the public at full price. In fact, rumor had it that the producers intended to keep it in dress rehearsals its entire run and never formally open it.
 * Then again, there's no rule that says critics have to wait for opening night to review a show either—a fact many reviewers took advantage of when the official opening had been delayed one too many times. To say they were unkind would be a massive understatement.
 * "Poppa's Blues" from Starlight Express is a blues song about how blues songs are built -- and it invokes the former name of this trope in its second verse, after the first verse explains how you repeat the first line of a verse to give you time to think of a rhyme: