We proposed and tested the notion of a bidirectional influence of emotion expressions and context. In two studies (N = 215, N = 222), we found that the expressions shown by supporters and opponents of a player in a ball game were used by observers to correctly deduce the eliciting situationi.e. the outcome of the game. Conversely, knowledge of the outcome of the game (as well as real world knowledge of the negative interdependence of opponents in a competitive game) influenced the perception of both the emotions shown (Study 1) and the perceived bias/emotional control exhibited by the expressers (Study 2). This research contributes to a growing body of research that shows that both situations and emotion expressions contain intrinsic meaningful information and that both sources of information are used by observers in a social appraisal process.