A few days ago there was something quite startling, I got a PageRank 8 for one of my site. This happened after my hosting do maintenance on their servers, and my website can not be accessed during one to two days.
Looks like when the site could not be accessed, the Googleâs spiders redirected to a site that has a high PageRank. In a few days or weeks would all go back to normal PageRank again.
Updated on July 3th: after asking reconsideration to Google my site are back to normal again. But finally I got a valid Pagerank 8 for my blog, read this for more information.