A Spanish 12 year old has reportedly made a big mistake, when he confused Google Adwords and AdSense trying to sell his brand. This mistake almost cost him $112,000. Oops.
José Javier had signed up for Adwords instead of AdSense, with the belief that he would make money when people clicked on the advertisement. Unknown to him that the service actually charges account holders for clicks on their advertisements.
I guess he probably couldn't tell the difference. However, the company (Google) fully understood the situation.
Javier would not be charged as Google has reserved it's comments in response to NBC News' request for comments. By the way Google has a page that explains the difference between these two.