Instead of presenting two choices: credit or debit, they ask the question "Is this a debit card?" I am using a debit card so the answer is yes, it is a debit card; but you can answer no and they will process as a credit card. It makes me think about it each time. Pretty sneaky -- I am sure it raised their debit card rate
There are two protocols for running a card: "debit" and "credit". "Debit" uses a PIN, and "credit" uses a signature.
There are two types of cards, "debit card" and "credit card". "Debit card" is tied to a bank account, and "credit card" carries a balance paid off at the end of the month.
There isn't a strong connection between the two, at least in America. But when I was working full-time in retail, people would occasionally hand me their cards and say "it's a debit card". The retailer I worked at only supported the "credit" (signature) protocol, so I nodded and ignored the request.
To use credit, you have to press "cancel", which wouldn't be the first thing to come to your mind.
At the HEB grocery stores in Texas, every price sticker includes price/ounce or price/count. I was surprised by how often buying in bulk is more expensive. Take eggs for instance, there's a 50-50 chance that eggs in the 18-pack will cost a few cents more than the eggs in the 12-pack.
* Only allow flagging if viewing the permalink causes less flagging
* No changing votes and small buttons causes people to think more about voting
* Little to no help keeps only the dedicated coming to the site
That last one prevents me from buying a lot of things, because it seems a downright insulting thing to do to a potential customer.
"How much is it?"
"$10 + X"
"How much is X?"
"Hand over your wallet first. We'll return it!"
"Why Don't We Show the Price? Some manufacturers place restrictions on how prices on their products may be communicated."
But true, that does put it outside "Dark Designs".
Of course, this has to be balanced with the desire to devote as much space as possible to content and have the browser get out of the way of the browsing experience. But any browser notification that's displayed only in space that's otherwise content is just asking for trouble.
Quality engineers use the concept of a "poka-yoke" (http://en.wikipedia.org/wiki/Poka-yoke) to failsafe their processes and systems all the time.