Most hated question about your car?

For some reason, "what year is it?" always bugs me if the person doesn't know what kind of car it is. If I have somebody come up and say "Hey, nice Barracuda! What year is it?" I have no problem with it. But if it's some person who doesn't even know that the Barracuda was made before 1970, then it really irks me. I have no idea why.

Also the big block question.

I also once had somebody cruise by on a bike and shout "Nice camaro!"
Another time, somebody got up on the fender while the hood was open (engine running) and put a screwdriver on the valve cover. "Sounds like the valves need adjustment!" he said. I stared at him with a deadpan look and told him that it has a hydraulic flat tappet cam. He kinda just sulked off...