I used to work in the product side of the automotive industry. Luckily I have escaped, but my friends are in awe every time I start to tell them stories. My friends in the industry have their own stories, so I thought maybe some of you people do as well. So here are some of my stories:
Our supplier for early Mustang arm rest pads started cheapening out on us. What started as a molded pad with a stamped steel core devolved into a metal bar core with two nuts welded on it, and finally just no metal core and two hex nuts molded into the rubber.
Our supplier for Jeep front brake lines decided to make the lines out of copper pipe. Sent over a whole crate full of them, beautifully flared with the right flare nuts, but totally useless.
I got in an order of early Mustang control arm shafts that were ribbed instead of threaded. The manufacturer didn't even care why I refused them, just if I wanted to order again.
Front fenders stamped from sheet metal so thin and shallow you could pick them up and go "wubba wubba wubba" with them. We labeled those as "economy" and sold them anyway.
Another arm rest pad story. We busted our supplier sending us "premium restoration quality" and "value quality" parts that were the same item. Different box, different part number, exact same product.
Mustang restoration parts stamped "MoFoCo" were fun. Ford wasn't amused either.
GTO quarter panel skins that were stamped wrong, but we couldn't afford to have the tooling remade, so we sold them with a disclaimer that you had to hack it apart to make it look right.
Replacement parking, turn signal, marker and tail light lenses all stamped "For Off Road Use Only" to get around being certified by the DOT.
I'll think of more I'm sure, but if anyone else has stories (doesn't have to be automotive) I'd love to hear them.