Either some one can sit on his pc and start clicking anyone's ad randomly or someone may use an automatic bot to click on ads again and again. Google has a click quality team to maintain quality control over the adsense and adwords programs. They ask advertisers to report click fraud if they feel it is happening and also submit data from their server logs. Google can also inform advertisers if they find out that the fraud is taking place so that the advertiser can also take necessary steps.

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