An inadvertent vent in the right ventricle (RV) resulted during dissection of a deep intramyocardial left anterior descending coronary artery (LAD). during off-pump coronary artery bypass grafting (OPCAB). led to pulmonary artery air embolism and hemodynamic instability. requiring conversion to cardiopulmonary bypass (CPB) prior to repair. https://www.alarecre.com/Looney-Tunes-Marvin-the-Martian-Big-Head-Galaxy-S23-Waterproof-Case-p116784/