Tensions between the Humane Society of the United States and United Egg Producers have existed for more than a decade. When the two sides are asked why they don’t come together to negotiate their differences, each answers that the other is someone with whom negotiation is difficult if not impossible. Often it is those parties with whom we dread having a negotiation to reconcile differences are the ones we need to focus on the most in order to achieve our goals. How do you negotiate with someone whose interests seem so contrary to your own? Sometimes, even in the most difficult negotiations, a win-win outcome is possible. How can forming a novel alliance help your organization in its next negotiation with an intolerable counterpart?