Most hated question about your car?
I seem to get "do you do all the work on that?" an awful lot. I do most of my own work, but occasionally I'll farm something out when I don't want to do it, although I'm doing that less and less anymore because I can usually do it better by myself, or at least I think I can. I still want to ask, "what's it matter?"
I also get the "is this yours?" quite a bit. I just got that this weekend as my wife and I were sitting in my '53 Buick at a car show this weekend. I like the "It is now!" comment, but I usually just stare at them awkwardly so they go away. :)