When a droplet is gently deposited onto a vibrated liquid bath, the droplet could bounce repeatedly, avoiding coalescence. This peculiar behavior discovered in 2005  is the starting point of an active research on pilot wave dynamics (see for example our project QUANDROPS) and droplet resonance effects . In our last article on the subject , we demonstrated that the bouncing behavior of polymeric droplets onto highly viscous bath allows us to study/measure the elongational viscosity of the polymeric samples. It is found that large elongational viscosity of the polymer solution droplets suppressed large droplet deformations.
 Y. Couder, E. Fort, C.-H. Gautier, and A. Boudaoud, Phys. Rev. Lett. 94, 177801 (2005).  S.Dorbolo, D.Terwagne, N.Vandewalle, and T.Gilet, New J. Phys. 10, 113021 (2008) – PDF
 S. Gier, S. Dorbolo, D. Terwagne, N. Vandewalle, and C. Wagner, Bouncing of polymeric droplets on liquid interfaces, Phys. Rev. E 86, 066314 (2012) – PDF