So not exactly world-shattering, but certainly droplet-shattering. I was curious about people who had done this kind of thing -- and Google was kind, yielding up Robert Park's interesting web page. Image after image (and movies) of water droplets colliding: slow and fast, symmetric and asymmetric, head on and glancing. Interestingly, a colleague of mine looked at these yesterday and saw very low-energy nuclear physics (neutron necking, and the like). I looked at these and tried to imagine them relativistically.