  The splashing of a drop impacting onto a liquid pool produces a range of
different sized micro-droplets. At high impact velocities, the most significant
source of these droplets is a thin liquid jet emerging at the start of the
impact from the neck that connects the drop to the pool. We use
ultra-high-speed video imaging in combination with high-resolution numerical
simulations to show how the ejecta gives way to irregular splashing. At higher
Reynolds number, its base becomes unstable, shedding vortex rings into the
liquid from the free surface in an axisymmetric von K\'arm\'an vortex street,
thus breaking the ejecta sheet as it forms.
