A few that tend to land:
1. Make it concrete: "Great, then unlock your phone and hand it to me." Almost nobody does, because privacy isn't about hiding wrongdoing, it's about choosing who sees what.
2. You don't get to decide what's wrong. Data collected today is judged by tomorrow's laws, governments and employers, and it never expires.
3. It's not one fact, it's aggregation: harmless pieces (location, purchases, contacts) combine into a profile that reveals far more than any single one.
4. Snowden's version: saying you don't care about privacy because you have nothing to hide is like saying you don't care about free speech because you have nothing to say.
For depth, Daniel Solove's essay "I've Got Nothing to Hide and Other Misunderstandings of Privacy" takes the argument apart properly.
