Every year, during the Fluid Dynamics conference organised by the American Physical Society, there is a competition to find the best film-demonstration of phenomena related to fluid mechanics. Alexis Duchesne (post-doc), Charles Dubois (doctoral student ARC) and Hervé Caps (professor) at GRASP (Group for Research and Applications in Statistical Physics) of the University of Liege, have won first prize in a competition involving more than 100 videos.