The endogenous feedback loop where initial coups lower normative and practical barriers to subsequent attempts, creating a self-reinforcing cycle. Mechanisms include: (1) normalization of military intervention, (2) weakening of civilian institutions, (3) demonstrated feasibility reducing coordination costs, (4) economic damage from instability further increasing grievances. First articulated by Londregan & Poole (1990). Countries in the coup trap face 3-5x higher risk than those without coup history.