Normally when you think of “bad design”, you think of laziness or mistakes. These are known as design anti-patterns. Dark Patterns are different – they are not mistakes, they are carefully crafted with a solid understanding of human psychology, and they do not have the user’s interests in mind.
An interesting library of ‘dark patterns’ – user interface design tricks used on the web. On this iPad the link to the library is at the top of the page, as opposed to on the left as the page states. Worth a look.