Ask questions. Either people will or won’t engage but if you have any credibility with them, they have a little bit of buy in to listen to your shit. Then you just might get them curious.
Just the other day I was walking through our local VA campus and I was curious about why every roof of the buildings built in the 1920s has a bunch of little house looking vent things on the top. I think I know the answer but I’m still curious about it.
Probably not a good example of something to spark curiosity with, but you never know what will.