Auto-ignorance
I can't tell cars apart. I can tell a car from a truck or even an SUV. I can identify colors and age (within a decade). Once I get close enough, I can read the vehicle name. But apart from that, a car is a car.

DOB sees things differently. He can identify a car going 75 on the opposite side of a six-lane freeway. If we are driving through his hometown, where he used to work in car insurance, he can also tell you who owns the car. I have trouble identifying our car in a parking lot.

Recently, DOB has decided that he would like to purchase a Pontiac (I think) Bonneville someday. In furtherance of this goal, he has instituted a game of "Spot the Bonneville." I still have trouble remembering he's not talking about a public utility, and pleaded for a game of "Slug Bug" instead (I can identify them), but to no avail. He did establish the rule that there would be no detriment to points from an incorrect identification.

So one day he had just spotted a Bonneville and was trying to point out to me the virtues of the Bonneville in styling so that I could better identify it. I tried to notice the shape and features of the car. Then, emboldened by the knowledge that it wouldn't hurt me to be wrong, I pointed at the next likely candidate and shouted, "Bonneville!"

Then I realized I was pointing at the lot of a Saturn dealership.