Sauron returning?

[Lord Melkor]

As we all know Sauron was reduced to a houseless spirit after the destruction of the ring and was forever uncapable of taking form again. However, in Morgoth's ring there is an part describing how those communing with the spirits of the dead and other wraiths has certain dangers, the most important one being possession of the hroa of the summoner by the summoned spirit. Now, could it be possible that a foolish human trying to commune with spirits encounters Sauron, who takes this opportunity to take over the hapless human? Of course he would possess the body of a human and wouldn't be as powerful as he was when he still was the Lord of the Rings, but he still could cause great harm, like using his cunning mind to become a bloodthirsty despot like Genghis Khan or something like that. An interesting idea or total bullocks?