We get cars in at work with owners that know little to nothing about cars, all the time. Got a customer with a '32 Ford 3-window rod. He wouldn't know a spark plug from a valve cover. He didn't checkbook build it, but bought it already finished but still. You'd think if you wanted a car like that, you'd at least know SOMETHING about cars. I could list a few others besides that one.
Then again,,,,,,,,,at least they KNOW they don't know anything about cars and don't try to fix it themselves first. Then there's ones where the guy THINKS he knows all about cars, screws it up totally working on it himself and then brings it in. Then you have to back up and undo his work and start from scratch.
This isn't really on topic but have to do a little rant.
Some cars we get in will look really nice on the outside and interior. Then you put them on the hoist and they're a giant cobbled mess. Open the hood and shake your head and wonder what caveman was in there before. Wire nuts are for house wiring, not automotive. Duct tape is for anything except ducts and is not a substitute for electrical tape. A bungie cord is not a battery hold down. I could go on..............Rant over.