Here's one I've been kicking in my head for years:
The laws of Southeast Asian Pacific countries such as Malaysia, Thailand, and Singapore towards drug smuggling are notoriously strict. Individuals who bring banned substances into their borders, regardless of circumstance, are swiftly executed. There have been horror stories of innocent people losing their lives in these countries because someone had secretly placed some banned substance inside their luggage.
Here's an outlandish situation to consider: what if Prince Charles of the United Kingdom, heir to the British crown, were caught smuggling a banned substance into one of these countries?
1. Would the countries execute the prince per their laws, or would they make an exception for him because of his status? If they execute him, would they risk some sort of retaliation (either political/economic or military) from Britain? If they don't execute him, how would they enforce their laws in the future?
2. If the country in question decides to execute Charles and refuses to negotiate with Britain for his release, would Britain go to war to save their future monarch? Or would they agree that he had broken the hypothetical country's law and had to pay the penalty, prince or no prince?