if you set a dish filled with water onto a loudspeaker or other vibrator and make vibration, When it oscillates, it is possible to hold small droplets on its surface for a long time. I mean, when you put a droplet of water on vibrating water surface, it doesn't coalesce with the water and bounce on the surface of water.( see this video https://youtu.be/KZ5ZLPWasrM )
As we know, drop reaches its minimal potential when coalescing with water ( that's why drops coalesce)
what exactly cause this? why doesn't the drop coalesce with the water?