For decades, the focus of Metaphor Studies laid on Conceptual Metaphor and its role in the human conceptual system. This study, however, focuses on metaphor in communication. Its aim is to shed light on how commenters in online debates discuss EU-related topics via Scenario Negotiation, expressing and negotiating their points of view via Metaphorical Scenarios. The study offers a review of current metaphor theory and practical approaches and proposes an Integrated Model of Scenario Negotiation. The results are based on context-sensitive, qualitative analysis of data which stem from a corpus of online debates from the Guardian's Comment is free section. The discussion illustrates the genre-specific conceptual-communicative functions of Scenario Negotiation in naturally occurring discourse.