Today, when the day started, I checked my account to find a really really high ctr. I thought I was click bombed, so I contacted Google. I'm not sure whether I'm allowed to disclose my ctr here, so I will just tell you that I earned $1.6 for 10 impressions. I has a usually high cpc though.
have you installed statcounter or Google Analytics? Are all the clicks coming from one person? Does that person clicks 9 times within 5 minutes? I think you can get a better idea by checking the traffic stat.