Water drops
High speed photography has a long history. The first systematic analysis of water droplet splashes was done by an English physics professor by the name of A.M. Worthington in 1894 who used a crude electric discharge to freeze the image of the splash on old fashioned film plates.
Over the years many photographers have used modern equipment to improve the original technique, using high speed flashes, electronic triggers and digital photography. It is now possible to freeze every stage of the splash in minute detail.