A balloon device includes an inner container and an outer container that are movable with respect to each other. The device includes a pressurized gas container mounted in the inner container and a firing mechanism that is operated by slamming the device against a solid surface such as a table top or the like. The firing mechanism punctures the pressurized container and permits gas to escape into the device, and this gas is guided via orifices to the balloon that is sealingly held on the device by an O-ring type element. When the balloon is pressurized to a prescribed pressure, further pressurization of the device will move the inner container and the surface against which the O-ring seats disappears as the inner container moves with respect to the outer container. The balloon is released and sealed as the O-ring is released.
