A small impact
Jet formation after the impact of a steel ball of radius 1.25cm on loose very fine sand. The jet in this experiment exceeds the release height of the ball.
Frames 2-4: splash
Frames 5-6: a jet emerges
Frame 7: clustering within the jet
Frames 8-9: granular eruption at the surface
Image credit: D Lohse et al arXiv.org/abs/cond-mat/0406368.