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If this will happen one day, I don't have any clue how to evidence to Google that it wasn't me. Such action can do anybody.
I am asking this because a few weeks ago I noticed some clicks from unidentified site. This keeps happening every day with 1 or 2 clicks (few cents). I am worried because I can not find source from clicks are generated and if there's someone saying "Visit our sponsors", "Support us" on Ad following my pub-id. I doubt it is from some traffic exchange program because there's no big fluctuaions about impressions and they are also very well monitored.
Is it's any reassurance, I've been the victim of click attacks on two occasions, and I still have my AdSense account.