as the title suggests, i had been mulling over in my head how to do this since i was introduced to metaballs and keyframing in the complete blender series. After coming back to keyframing in the creating a character series it dawned on me how to do it, this is the result of a idea that had been nagging at me.
Behold!, i have conjured Raining Goop! https://youtu.be/exv_HcEn8zs