"Professional" mechanics that don't know how to read a VIN.
That was the first thing they taught us in auto repair during high school. It isn't that fucking hard.
Mechanic: "Yeah, I've got an August 2005 Ford Taurus...."
Me: "Give me the VIN."
Mechanic: "Anything August or after means its an '06."
Me: "No, it really doesn't. Give me the VIN."
And I then proceed to teach mechanics shit they should've learned in high school. The 10th digit of the VIN signifies the model year. I don't care if it was produced in May/June/July of 2005, if your 10th digit is a 6, it's a 2006.