I always get the, "I didn't know BMW made motorcycles!"
Most of the questions I get pertain to ATGATT.
One day when leaving work I met up with a group going out to the parking lot. One gal said, "oh Ken I didn't know you rode a motorcycle." Which I responded, "actually I don't, but I save five dollars a year on my car insurance by wearing all this equipment." Everyone busted out laughing. Of course, she slapped me, knowing the smart aleck that I am.