it seems very difficult to figure out what this click is about. there may be some software to track out which ip the click is from, but what they click on.. hmm.. tough problem. my advice is focus on your content - but focus on expensive content
The solution is that you goto http://www.mybloglog.com and register yourself. Add your blog and add the stats code generated to your site. once it is in place, it tells you the exact number of clicks, the URL of the page where the click was done and also the adsense unit. It will not tell you the IP of the person clicking the ads, but it surely gives you very useful stats. Though for free users they show only 10 records, you can pay $3 and have a full access to your stats. Hope it helps!
but what you do if you findout that link is highest and do you ask your friends to lcick on that ad ?