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Assuming they're adults, offer to set up a camera feed in their bathroom and stream it. They don't mind, and you'd do the work, so it'd be no problem for them and a very specific type of audience would love it. They could likely even earn a bit of money doing it so it's win/win!

Maybe some people even think they believe it when they say it, but I've yet to see anyone who is willing to demonstrate it when pressed, and I've even met a few people who have claimed that they have no concerns at all about their privacy, but who then ended up feeling violated when even small things they assumed were private ended up being exposed.