This talk explores the responsibility of a designer and demonstrates why sometimes "over-designed" is good. User interface is often seen as a crystal goblet, a transparent container which should emphasise but never obstruct the content. A lot has been said and written about the "disappearing computer' or natural user interfaces and "the best UI is no UI" mantra is so ubiquitous today. In my talk I hope to shed a new light on these concepts demonstrating how the "no UI" approach may sometimes be considered harmful, and results in products which confuse, scare, or deceive people.