Pendant drops spontaneously appear on the underside of wet surfaces through the Rayleigh-Taylor instability. Due to their detrimental effect on coatings and their tendency to drip, several strategies have been developed to avoid their formation and rationalized with linear stability analysis. I will first briefly show how the Rayleigh-Taylor instability can be harnessed to make patterned elastic surfaces with a tunable spacing [1] and aspect ratio [2]. However, having a fine control over the drops in the non-linear regime of the instability is hard. They are connected to a thin film with which they continuously exchange liquid. They thus have no contact line and move around easily which disrupt the pattern. I investigate these drops dynamic experimentally, numerically and theoretically with a model system that consider a single pendant drop surrounded by a uniform thin film. I will show that under smooth surfaces, a transition from growth to decay occurs as the substrate inclination angle is increased by a few degrees [3]. I will then consider uneven surfaces, and show that the underlying topography can control the drop motion via gravito-capillary pinning-like forces [4].