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I have no knowledge of this ever happening. But I do recall someone back in May complaining about his PR 0, and that he was subsequently SHOCKED to discover a rogue robots meta on his site.
I think a disgruntled employee or gilrfriend must have downloaded his index page and played with his robots meta.
Of course, with the lousy passwords many people use (anybody here use the word "LOVE" as their password?), it wouldn't be hard for an evil teenager to hijack a web site.