I had the pinnacle of dumb conversations the other day regarding my M5. He was a really nice guy but didn't know much about cars
Me: Pull in to gas station
Him: Does that have the K&N's?
Me: What?
Him: K&N intakes! That thing is loud!
Me: Hey man no just an exhaust / tune (muffler delete)
Him: Damn what is that thing? An AMG Mercedes?
Me: Lol no its a BMW...
Him: Damn well I have a Hemi (he was driving a Chrysler 300C)
Me: Oh nice. Those are great engines.
Him: Yeah it makes 320hp. What does that make?
Me: A little over 400...
Him: DAMN! Didn't know bmw's were fast.
I changed the subject back to his car after that