A 52-year male patient presented with severe shortness of breath in casualty. He was in cardiogenic shock with blood pressure of 80/50 mm Hg. He was recently diagnosed with deep venous thrombosis in lower limbs. He was started with in otropic and vasopressor infusion, and was immediately shifted to ICU. Transthoracic echocardiography was done, which revealed freely moving large clot in right atrium and thrombus attached to right ventricular wall [Figure 1] and [Figure 2], [Clip 1] and [Clip 2]. As the echocardiography was being done, the large clot in RA suddenly moved into RV [Figure 3] and [Clip 3] and within a flash of second, the huge clot moved to pulmonary artery [Clip 3]. Patient had severe hypotension and cardiopulmonary resuscitation was initiated. Patient could not be revived back.