I could hardly believe it when I read about it!
It seems that one of the Adsense publishers was being blackmailed from someone (the place of origin seems to be from Algeria) who was using their Adsense search engine to click multiple times on the Adsense ads. Of course that made the Adsense publisher's adsense earnings go up but its also a red flag to invalid click activity!.
After the Adsense publsiher's adsense earnings went up they received an email from the blackmailer wanting the Adsense publisher to send them half of the Adsense money that they earned because of the increased clicks otherwise the blackmailer would continue to make many Adsense clicks thereby causing a red flag to Adsense in the hopes that Adsense would ban the Adsense publisher's account!
Fortunately from what I know so far, the Adsense publisher didn't give in to the blackmailer but posted about their experience online.
You can find out more about this by clicking here.