The rebound of droplets were recorded at 3000-12000 fps using a highspeed camera (Photron Fastcam Nova). The droplet's position and speed are tracked using open-source image analysis softwares: Open Source Physics Tracker and Fiji. Measuring friction. We used a cantileverbased method to measure the friction force F fric acting on the droplet, as shown by the schematic in Figure and described in details in our previous publications. Briefly, a droplet is attached by its capillarity to an acrylic tube with an outer and inner radii of 0.36 and 0.29 mm, respectively, and length of between 5 and 7 cm. The surface was moved back-and-forth at a controlled speed of U # = 5-2400 µm s -1 using a motorized stage. F fric can then be inferred from the cantilever deflection ∆x (averaged over several cycles), since F fric = k∆x where k = 21-60 mN m -1 is the flexular spring constant. ∆x can be measured using a high magnification camera as was done previously or in this case a confocal chromatic sensor (Micro-epsilon Confocal DT) with submicron resolutions.