Abstract : We investigate in several experiments the link between dissipation and deformable liquid interfaces. First, we study Leidenfrost drops moving on various substrates. Their movement can be either accelerated — on a ratchet-like substrate — or slowed down. The deceleration allows us to study different types of friction. On a smooth solid, the drag is very low and mainly due to the surrounding air. On a crenellated surface, it is a consequence of the liquid impacting the side of the squares. Last, a drop sliding on another liquid decelerates because of wave resistance arising from the wake it generates. In a second part, we characterize viscous threads deformations. Compression and torsion of the filaments result into viscous buckling, which we compare to elastic buckling. However, if the thread is not forced to move, the evolution of its shape comes out of a balance between viscous, gravity and capillary effects.