This one takes a little bit of background. For those unfamiliar with vintage Harley-Davidsons, their heavy motorcycles built from 1936-1984 had 3 engine types.
* Knucklehead (1936-1947)
* Panhead (1948-1965)
* Shovelhead (1966-1984)
I'm out for a ride one morning and my bike (1949 Panhead) is parked among a lot of other bikes at a popular gathering spot. As I walk up to my bike a guy is "schooling" his buddy about it. He's telling him it's an old Harley w/ a Shovelhead motor. I correct him and tell him, it's a Panhead, not a Shovelhead. He tells me, "No, that's a Shovelhead, blah, blah, blah". I just said, "Ok..." pulled out key and put it in the ignition... "I guess I've been mistaken about what I ride all these years." His buddy just starts laughing and called him an idiot.