One of the earliest Ghibli works, Sora Iro no Tane or The Sky-Colored Seed, was an advertisement broadcast on Japanese TV in 1992.
This little green dude seems to be the mascot of the product, he seems to be a pig:
I can't find any information about what it was advertising originally, and I can't draw a logical conclusion from the show.
Does anyone know what it was advertising? And how were the animation clips relevant?