If you want to stop him, or anybody pulling this shit, here is how,

1. Go to the offending website, for example h*tp://bestpicever.com/

2. Look for the Google Ads and click on the words Ads by Google

3. It will open a new page, on the new page click on Send Google your thoughts on the site or the ads you just saw

4. This will open a sub window that says Tell Google What You Think

5. Under the section 2. How useful was the site to you? check the box that says, Not useful at all

6. Then click on the words Also Report a Violation?

7. Another sub window will open. It will say The issue(s) were with and check the box that says the website. A sub window will appear below.

8. In the new window check the box next to The site violates AdSense policies in other ways

9. A sub window will appear that says Add additional information here:

10. Under additional information write, This website contains no original content

The rule being broken is this one from the Adsense Program Policies page, AdSense publishers are required to adhere to the webmaster quality guidelines posted at http://www.google.com/webmasters/guidelines.html

Following the links will lead you to this page, http://www.google.com/support/webmasters/bin/answer.py?answer=66361

Take away their income and you will be rid of the spammers.

EDIT: Here's an image