suzukik - 8:16 pm on Feb 4, 2009 (gmt 0) I encountered it in Japan.
That means that this is more than a simple one shot test, there are millions of people getting this test.
Its HTML code was totally different from that of normal SERP. There were no URLs found in the code though they showed on SERP. That will mean rank checking software couldn't retrieve the ranking data.
I encountered it in Japan.