A form of reductio ad absurdum, the if-then clause claims that if a is true, then a perfectly ridiculous b must also be true.
Dorothy Jr.: If this is romantic, then the Olive Garden must be Eden. Word Hero
If this is an opportunity, what’s Iraq? A once-in-a-lifetime chance? Richard Haas, a former state department official, in response to President George W. Bush calling Afghanistan an "opportunity"
If that car is an investment, then my Jimmy Choos count as asset management. Word Hero