This paper presents a critical view of existing models of user experience. These models view experience as the subjective response in the individual's mind. While designers and developers have to try to provide a satisfying user experience, the means to do so remain limited. This paper presents a missing aspect of user experience. Experience can be seen as an individual's reaction, but also as something constructed in social interaction. Designed artifacts, especially personal communication and digital media products, environments and systems can facilitate this kind of use. "Co-experience" is the experience that users themselves create together in social interaction. Keywords User experience, interaction design, co-experience