You sign a $4 million supply agreement with a logistics company headquartered in Houston. Eighteen months later, they breach. You pull out the contract to file suit in Manhattan, only to find a clause buried on page 27 that says any dispute must be litigated in Harris County, Texas, under Texas law. Suddenly your case isn't a New York case at all — and your local lawyer can't even file it. That single paragraph, often added during the final markup, can decide whether you win,