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The flow of viscous fluids with fixed boundaries displays quite enough complexity for most workers in fluid mechanics, giving rise to instabilities, transition, turbulence, separation and such. But, when a fluid-fluid interface is present, the possibilities for new phenomena increase significantly, in that thin films can sustain wave propagation, rupture, the mergence of corner and cusps and other interfacial singularities. In this lecture three systems will be discussed involving moving contact lines and phase transformation and demonstrating the surprising effects of interfacial deformation.