This study examines the presence of interface design called dark patterns. The term is used for web design that aims to deceive or influence users to do something that they do not intend to do and that benefits the company in question. Six different e-commerce websites are examined to investigate if any interface design can be categorized as dark patterns. The examples found are used as a basis for further discussing how users reflect regarding these methods. The study shows that interface design that is categorized as a dark pattern seems to be normalized by the users. The study also shows that the presence of dark patterns affects the user's trust in the site but does not necessarily lead to the user not returning to the site again.