I've heard others suggest something like "then you won't mind giving me your SSN/SIN, bank account details and PIN, all your e-mail and computer passwords..." and whatever else you can think of, and if they are still ok with that, then add "and I'll post them on the internet." I don't know how well it works though as I haven't had the chance to try it.
People who say this are assuming benign, rational actors, but there are plenty of predatory and irrational ones that will misuse your data. So a list of examples, general and specific, may help there.
Hmm, could we as a community compile such a list for people to use as a kit (assuming it hasn't been done already)? Then when people get the opportunity to use it, they could provide feedback that can be used to improve the kit. E.g., which examples work best, which don't, presentation methods, etc. Does this sound like something people would want, and/or want to contribute to? I know that I'd find it handy.