Background: Lawn trimmer injuries have an approximate incidence of 2.13 to 3.11 per 100,000 population. In this paper, we present a penetrating thoracoabdominal injury from a metal wire projectile from a lawn trimmer involving the right ventricle and diaphragm. Case history: An 18-year-old male with no significant medical history presented to an Emergency Department (ED) with a penetrating chest injury. The patient was a bystander 10 metres away when he was struck in the chest with a wire which had been threaded to replace the standard nylon cord. An interval electrocardiogram showed progressive ST elevation in leads II, III, aVF, V4, and V5; and a troponin of 3,622. Results/Discussion: Reports in the literature include projectile injuries to the stomach, diaphragm, aorta, limb, eye, and lung. This case expands on the experience with penetrating trauma, specifically with lawn mowers/lawn trimmers. Penetrating trauma to the heart is often fatal due to exsanguination or tamponade.1 Four cases from lawn mowers were identified in the literature.1 Patients in these reports all presented with haemodynamic compromise. Conclusion: Ground objects mobilized by the rotating blades of motorized lawn equipment can reach velocities comparable to cartridge driven projectiles from hand weapons. This case study reinforces the importance of recognising the potential devastating effects of projectile injuries and early multidisciplinary surgical input in evaluating penetrating trauma. References 1. Karigyo CJ, Fan OG, Yoshida MM, Menescal RJ, Tarasiewich MJ. Transfixing cardiac injury with perforations in stomach, diaphragm and lung: unusual scenario in penetrating trauma. Rev Bras Cir Cardiovasc. 2014;29(1):103-106.