We consider theoretically the evolution of a fluid-fluid interface set into motion by intense localized pressures caused by focused ultrasound. Depending upon the levels of gravity and surface tension, the interface is found to form either axisymmetric waves or to expel droplets which may be spherical, tear shaped or pancake like. Phase diagrams of Weber number versus Froude number and Atwood number are presented. The pinch off process which effect drops is in all cases of the power law type with exponent 2/3 and is realized as a singularity in finite time. The study was motivated by the occurrence of lung hemorrhage during ultrasonic imaging and seeks a non-thermal, non-cavitational explanation for it. Specifically, it pursues the notion that bursts of ultrasound act to expel droplets that puncture the soft air-filled sacs in the lung plural surface allowing them to fill with blood.