I have something that I call 'Potato-Law' for this.

It's like how the potatoes in discounters always say 'premium quality' or 'premium potatoes' but if they are, they wouldn't be so cheap or you couldn't buy them at the discounter. OTOH, if you go to a specialty goods shop, they don't write premium on their products. So if something has to be labeled on how good it is, it's probably not.

Right in the crotch. I recently put small bag of potatoes in the shopping cart and only back home and from the price on the receipt I learned they are "premium potatoes". So pissed off.