Same. I'll be driving along or walking down the street and my mind will wander to "I wonder what Franklin would think about cars. How do I even explain how they work? And let's not even get into cellphones." Faraday is another common target. It's always someone I could picture having a beer with, rather than some interminable boor (I imagine) like Newton.

The "tour" description is perfect; I'm always explaining or showing the person around or something. I imagine there's some ego component here; I only have a popular-science level understanding of these things, and my explanations would only be interesting to someone from the past or otherwise detached from society (which is also something I think about).

This all manifests as a bit of a mind game or thought experiment; it's not as though I'm actually conversing with the person. It's almost entirely one-sided: me imagining how I might explain the world to someone smart and curious but without any modern scientific knowledge.