Immersion can lead to dissociation from the real world when someone becomes deeply absorbed in an activity, such as shopping on mobile phones or laptops. Sometimes, customers may become immersed in dark behaviors that negatively effect their well-being. This qualitative study investigates the phenomenon with the following research question: What kinds of dark sides do customers describe experiencing while immersed in online shopping? To explore this, we conducted 33 semi-structured interviews with young Finnish online shoppers. Using inductive coding as our analysis method, we identified two main themes related to the dark sides of customer immersion in online shopping. First, participants described self-destructive behaviors stemming from their own actions—such as gambling or gaming-like thrill-seeking and impulsive overbuying—resulting in heightened anxiety. Second, they described experiences perceived as negative but caused by online stores, including feelings of betrayal, pressure, and being overwhelmed by endless options.