For me it was a female coworker complimenting my Q50 Redsport. Interned at a 3 letter fed agency last summer and one of the other interns who I became friendly with was a mid 20’s former sorority girl - someone you’d never expect to be a car enthusiast. Gave her a ride after work one day since her car was in the shop and immediately after walking up to my car in the garage, started complimenting it. Talked about the VR30TT engine and asked me if the turbos were giving me any trouble, then talked a little shit about how it’s still slower than her car. I asked her what she drove and she had an M2 lol
I think the most interesting/surprising interaction was when I was at a stop light with the GT4, windows down on a nice day, and some teenagers in the car next to me had some words. “Bro is that a GT3?”, “No it’s a GT4”, “Flex on us!”. I paused for a second, then smiled as I realized what they were asking, and gave her a good couple revs.
On the whole, the most surprising thing to me, though, is contrary to that story, I get more attention in my Mach 1 than the Porsche. Maybe because of the color? (Grabber yellow vs blue)